Adi Shankara (c. 788-c. 820)

A founder with no contemporary witness

As with many founding religious figures of ancient India, no contemporary and independent document of Shankara's life has come down to us. The American philosopher writing for the Stanford Encyclopedia of Philosophy states it bluntly: "there are no reliable historical records of Śaṅkara's life beyond his own written works"^[2]. What is known of his biography comes from fourteen hagiographies known generically as Shankaravijaya ("the conquest of Shankara"), written several centuries — sometimes nearly a millennium — after his death, and "full of legends and fiction, often mutually contradictory"^[3]. The most influential, the Madhaviya Shankaravijaya, attributed to Vidyaranya or an author close to his circle, dates from the 14th century — more than five hundred years after the events it claims to recount.

This situation is not unique to Shankara: it recalls, all proportions kept, the case of Siddhartha Gautama or Guru Nanak, whose biographies likewise rest on narratives composed long after their deaths. The methodological rule remains the same for a serious encyclopedia: distinguish what history can establish from what piety subsequently constructed.

The debate over the dates: from the 5th century BC to the 8th century AD

The very monasteries (mathas) which tradition links to Shankara do not agree on his dates: the Kanchipuram tradition places him around 509 BC, that of Sringeri around 483 BC — datings founded on obscure references to a sovereign named "Vikramaditya" which no independent evidence can corroborate^[4]. The dating which dominated 20th-century scholarly publications, 788-820, taken up notably by Max Müller and Sarvepalli Radhakrishnan, places Shankara at the turn of the 8th and 9th centuries^[5].

This dating has, however, been challenged by recent academic research. The Japanese historian Hajime Nakamura argues instead for a range of 700 to 750, and the philosopher Karl Potter proposes a slightly earlier dating still, based on the chronology of his philosophical contemporary Mandana Mishra^[6]. The Japanese specialist of the Upadeshasahasri, Sengaku Mayeda, and the Russian Indologist Natalia Isaeva, likewise retain the 700-750 range^[7]. The most solid chronological bounds remain indirect: Shankara's works bear traces of debates with Buddhist and Mimamsaka authors of the 5th-7th centuries (ruling out a date before about 650), while the commentator Vachaspati Mishra, active in the 9th century, already cites Shankara as an established authority (fixing an upper bound around 800)^[8]. Ignispedia retains, following the traditional title still most widespread in popular literature, the range "c. 788-c. 820", while explicitly noting, as encyclopedic honesty requires, that the most rigorous contemporary scholarship leans rather towards the first half of the 8th century.

A belated glory: Shankara forgotten for three centuries

One historiographical finding often surprises readers accustomed to the image of Shankara as "the greatest philosopher of Hinduism": this reputation is not the one his contemporaries granted him. The British specialist of Indian philosophy Richard King writes bluntly: "although it is common to find Western scholars and Hindus arguing that Shankaracharya was the most influential and important figure in the history of Hindu intellectual thought, this does not seem to be justified by the historical evidence"^[9]. The Indologist Matthew Clark, author of the reference study on the Dashanami order, specifies: "Shankara was relatively unknown during his life-time, and probably for several centuries after, as there is no mention of him in Buddhist or Jain sources for centuries; nor is he mentioned by other important philosophers of the ninth and tenth centuries"^[10].

Until the 10th century, the dominant figure of non-dualist Vedanta was not Shankara at all, but his older contemporary Mandana Mishra, author of the influential treatise Brahma-siddhi^[11]. It was only from the 14th century onwards, under the impetus of the theologian-minister Vidyaranya, that Shankara retrospectively became the systematic founder and conquering hero of Advaita Vedanta — a point developed further in this article, in the section devoted to the construction of his legend.

Birth at Kaladi and the crocodile episode

According to the hagiographies, Shankara was born at Kaladi, a village in present-day Kerala, to elderly parents long childless, Shivaguru and Aryamba^[12]. As a child, he is said to have mastered the four Vedas by the age of eight — a classic hagiographical trope signalling the future master's precocity^[13]. His father died young, leaving his mother alone to raise him, and she at first opposed his desire for renunciation (sannyasa), a step which would have broken every tie with family life and left her without support in her old age.

The most famous episode of his childhood, present "in every hagiography"^[14], tells how one day, bathing in the Purna river, the young Shankara felt his leg seized by a crocodile. Seizing on his mother's terror, he asked her, in apparent article of death, for permission to become a wandering monk — permission she at once granted, upon which the crocodile released him^[15]. Whether the episode is exact fact or, more likely, a hagiographical parable meant to legitimize a rare and shocking breach with family in Indian society — the maternal permission required for the renunciation of an only son — it condenses the same narrative intention found in other founders' biographies: presenting as providential a decision which overturned the social conventions of the time.

The spiritual lineage: Gaudapada and Govinda Bhagavatpada

According to tradition, Shankara then travelled to the banks of the Narmada, where he met Govinda Bhagavatpada, an ascetic settled near Omkareshwar^[16]. Govinda is himself presented as a disciple of Gaudapada (6th century), author of a verse commentary (karika) on the Mandukya Upanishad which anticipates several central Advaita theses — notably the idea that waking experience has, in the last analysis, no more ontological status than dream^[17]. This intellectual filiation is significant: modern scholars, notably in the wake of comparative work on Madhyamaka Buddhism, have noted that the Gaudapada-karika bears manifest traces of Buddhist influence — a point which would later feed the accusation levelled against Shankara himself of being a "masked Buddhist", developed further in this article.

Travels and the debate with Mandana Mishra

Tradition attributes to Shankara a series of missionary journeys (often described as a digvijaya, a "conquest of the cardinal points") across the subcontinent, from Gujarat to Bengal, marked by public debates with proponents of Vedic ritualism, Buddhists, Jains and materialists (charvaka)^[18]. The episode most developed by hagiography is the debate with Mandana Mishra, a brilliant Mimamsaka exegete favouring salvation through ritual action rather than through knowledge alone. The traditional account has Mandana's wife, Ubhaya Bharati, serving as arbiter of a debate lasting several weeks; Mandana, defeated, is said to have taken the monastic veil under the name of Sureshvara^[19]. Modern critical scholarship remains cautious about this account: the later tradition identifies Mandana Mishra with Sureshvara, but this identification remains historically uncertain — the two authors may be distinct persons^[20]. What can be stated with greater certainty is that the Sureshvara who authored Vedantic commentaries (Naishkarmyasiddhi, sub-commentaries on the Upadeshasahasri and the Brihadaranyaka Upanishad Bhashya) does belong to the first generation of direct disciples of the Advaita tradition attributed to Shankara.

Death at thirty-two: Kedarnath or Kanchipuram?

The dominant tradition places Shankara's death at the age of only thirty-two^[21], at Kedarnath, the Himalayan shrine where he is said to have withdrawn into a cave never to emerge — which is why the place is venerated as his symbolic tomb^[22]. Other traditions, notably that of the monastery of Kanchipuram in Tamil Nadu, affirm on the contrary that Shankara attained siddhi (final accomplishment) and died there, while a third, minority tradition places his death in Kerala^[23]. This plurality of contradictory accounts, each matha seeking to legitimize its own direct filiation with the founder, reflects an institutional stake less than an established historical fact: each monastery has an interest in locating the master's death on its own spiritual territory.

The Brahma-sutra-bhashya and the preface on superimposition

Shankara's most undisputed work is his commentary (bhashya) on the Brahma-sutras of Badarayana, the founding text of the Vedanta school^[24]. The commentary opens with a long philosophical preface known as the Adhyasa-bhashya ("commentary on superimposition"), regarded by many specialists as the densest and most original text in the whole corpus attributed to Shankara. Shankara defines his object from the outset: "superimposition is the apparent presentation to consciousness, by way of remembrance, of something previously observed in some other thing"^[25]. He poses there the central problem of all Advaita metaphysics: how to explain that the pure subject (consciousness, designated by the pronoun "I") comes falsely to identify itself with the object (the body, the mind, designated by "this"), when "the subject and the object, which have for their spheres or contents the notions of 'I' and 'Thou' respectively, and which are opposed to each other as darkness and light, cannot be identified"^[26].

The commentaries on the Upanishads and the Bhagavad-Gita

To this founding commentary are added commentaries (bhashyas) on ten principal Upanishads (Isha, Kena, Katha, Prashna, Mundaka, Mandukya, Aitareya, Taittiriya, Chandogya and Brihadaranyaka) and on the Bhagavad-Gita^[27]. Together, these three corpora — Brahma-sutras, Upanishads, Bhagavad-Gita — constitute what the Vedantic tradition calls the prasthana-traya ("the threefold scriptural foundation")^[28], and the fact that Shankara commented on all three founding texts at once explains, historically, the particular authority his reading eventually acquired in the Vedanta school.

The Upadeshasahasri, the sole undisputed work of his own composition

Unlike the commentaries, which necessarily follow the structure of an earlier text, the Upadeshasahasri ("A Thousand Teachings") is the only freely composed work whose Shankaran authenticity commands a near-unanimous academic consensus^[29]. Comprising a prose part and a verse part, it systematically expounds the pedagogical method by which a master must lead a disciple to the liberating knowledge of Atman-Brahman identity. The Japanese scholar Sengaku Mayeda, who established the reference critical Sanskrit edition in 1973 before publishing the annotated English translation, is regarded as "the world's greatest authority on the Upadeshasahasri"^[30].

Hundreds of attributed texts: the authenticity problem

More than three hundred texts circulate today under Shankara's name^[31], but modern philological criticism retains only a restricted fraction as authentically his: the Brahma-sutra-bhashya, the commentaries on the ten principal Upanishads and the Bhagavad-Gita, and the Upadeshasahasri. The most debated case is the Vivekachudamani ("The Supreme Jewel of Discernment"), a poem very popular in the modern vulgarization of Advaita: contemporary specialists "tend to reject its authenticity"^[32], although the philosopher Ed Grimes notes that "there remains a probability that Shankara is its author", given its different audience and purpose from the exegetical works^[33]. By contrast, commentaries on secondary Upanishads (Kaushitaki, Maitri, Kaivalya notably), the Aparokshanubhuti, the Atma Bodha, and the doxographical compendium Sarva-darsana-siddhanta-sangraha, whose style differs markedly from the recognized works, are largely dismissed as late pseudepigrapha^[34]. Some very popular devotional hymns (stotras), such as the Bhaja Govindam or the Dakshinamurti Stotra, are on the other hand generally accepted as authentic^[35].

This philological discipline is no mere academic exercise: it directly conditions what an honest encyclopedia may attribute, without reservation, to Shankara himself rather than to the vast tradition of admirers who continued, for centuries, to write under his name.

Brahman and Atman: a radical identity

The heart of Shankara's metaphysics lies in one formidably simple affirmation: "the ātman is pure non-intentional consciousness. It is one without a second, nondual, infinite existence, and numerically identical with brahman"^[36]. This identity is not, for Shankara, one philosophical thesis among others to be demonstrated by discursive reasoning: it is what the four great sayings (mahavakyas) of the Upanishads directly reveal, the most famous of which, drawn from the Chandogya Upanishad, is tat tvam asi — "Thou art That"^[37].

"Neither am I mind, nor intelligence, nor ego, nor thought, nor am I ears or the tongue or the nose or the eyes, nor am I earth or sky or air or the light. I am the form of consciousness and bliss; I am Shiva, I am Shiva." — attributed to Adi Shankara, Nirvana Shatakam ("The six stanzas of nirvana")^[38]

This chant, one of the most popular of the devotional corpus attributed to Shankara, illustrates by the method called neti neti ("not this, not that") the Advaita procedure: successively stripping the subject of every identification with body, senses, mind and ego, until only pure consciousness subsists, qualified in the end as identical with the Absolute.

"Brahman is real, the world is illusory": the status of Maya

The formula which best sums up, in Indian popular tradition itself, the Advaita doctrine — without belonging to Shankara's authentic corpus — runs in half a Sanskrit verse: brahma satyam jagat mithya, jivo brahmaiva na aparah — "Brahman is real, the world is illusory (or: provisional), and the individual soul is nothing other than Brahman"^[39]. A frequent misunderstanding must however be avoided: Shankara does not say that the world does not exist at all, as pure nothingness; he affirms that the world has no absolute and independent reality — it is neither purely real (like Brahman), nor purely unreal (like a hare's horn, the classic image of the purely impossible), but indeterminable in its own ontological status, a category Sanskrit designates by anirvacaniya^[40]. It is this intermediate reality, neither fully real nor purely fictitious, which the technical term maya designates.

Ignorance and superimposition: the rope and the snake

The most famous image illustrating this mechanism is the one borrowed by Shankara himself, of the rope mistaken for a snake in the dark:

"It is just like seeing a snake in a rope in the dark." — Adi Shankara, Adhyasa-bhashya, preface to the Brahma-sutra-bhashya, trans. Swami Vireshwarananda, 1936^[41]

Just as the perceived snake never really existed — only the rope existed — so the world of differences (me, you, subject, object, body, universe) never had the independent existence which ignorance (avidya) lends it: "it is this ignorance which is the cause of all this duality, Brahman being mistaken for the world"^[42]. In other words, it is not the rope which turns into a snake — as though Brahman itself really metamorphosed into the material universe — but the knowledge of the rope which alone dispels the illusion of the snake^[43]: likewise, "it is the knowledge of the rope alone that removes the illusion of the snake and nothing else"^[44].

The two levels of truth

To hold together everyday experience (where the world, the body and other persons certainly appear real) and ultimate truth (where only Brahman is real), Shankara distinguishes two hierarchized levels of truth: the empirical or conventional level (vyavaharika), where the categories of subject, object, causality and multiplicity have real practical validity, and the ultimate level (paramarthika), where only the non-duality of Brahman subsists^[45]. The relation between the two is asymmetrical: the empirical world depends entirely on Brahman to exist, while Brahman depends on the world in no way^[46]. This two-storey architecture lets Shankara avoid an immediate objection — if there is nothing but Brahman, why does the world appear to us so constantly real and differentiated? — without thereby granting the phenomenal world the status of a substantial creation distinct from its creator, as the Catholic critique of this doctrine will argue further in this article.

The four great sayings and the four monasteries

Later tradition organized the Advaita doctrine around four mahavakyas, each drawn from a distinct Veda and associated with one of the four monasteries (mathas) which legend attributes to Shankara's foundation:

According to tradition, each of these four monasteries was entrusted to one of Shankara's four direct disciples — respectively Sureshvara, Hastamalaka, Padmapada and Totaka^[47]. This symmetrical architecture, seductive in its coherence, is itself a late hagiographical construction, as the following section of this article shows.

Liberation through knowledge alone

For Shankara, liberation (moksha) is not an accomplishment to be obtained through ritual action or the accumulation of merit, but the simple recognition of an identity already accomplished from all eternity: "one becomes brahman simply by knowing brahman"^[48]. This knowledge is not acquired by progressive degrees like a technical skill, but arises, according to the doctrine, from the correct hearing (sravana) of the great Upanishadic sayings, without in itself requiring the mediation of lengthy meditative practice^[49]. A man thus liberated while living (jivan-mukta) "continues to live as an embodied individual experiencing the world", but in the permanent recognition that this individuality has, in the last analysis, no reality of its own^[50].

The "masked Buddhist" accusation

From the Indian Middle Ages onwards, rival Hindu currents — notably Vaishnavite ones — accused Shankara of being a "pracchanna bauddha", a Buddhist masked in orthodox Brahmanical garb^[51]. The accusation is not without historical foundation: Shankara's own intellectual lineage, via Gaudapada, bears documented traces of Madhyamaka Buddhist influence, notably in its use of the dialectical method and in certain formulations on the ultimate unreality of the phenomenal world^[52]. The Advaita tradition, however, rejects this label by insisting on a major structural difference: where classical Buddhism teaches the absence of any permanent self (anatman), Shankara affirms on the contrary the existence of a unique, eternal Self (atman) identical with Brahman — a positive metaphysical affirmation which Buddhism, in its classical form, precisely refuses to make^[53]. The philosophical debate between the Advaita school and the Madhyamaka Buddhist school, developed notably by the philosopher Nagarjuna, lies beyond the scope of this article devoted to Shankara.

Ramanuja and Madhva: the two great rival Vedanta schools

Shankara's Advaita is not the only Vedantic reading of the Brahma-sutras. Three centuries after him, the Tamil theologian Ramanuja (1017-1137) elaborated Vishishtadvaita ("qualified non-dualism"), which refuses the pure and simple identity between soul and Brahman in favour of a relation of organic dependence — soul and world as the "body" of Brahman, distinct from him without being exterior to him. Two centuries later still, Madhva (c. 1238-c. 1317) broke still more radically with Shankara by founding Dvaita, a strict dualism maintaining an eternal and irreducible difference between the individual soul and God, even in the liberated state. These three schools — Advaita, Vishishtadvaita, Dvaita — still structure, today, the intellectual landscape of Hindu Vedanta, each claiming its own reading of the same scriptural texts.

Mandana Mishra, the dominant figure until the 10th century

As noted above, contemporary Vedanta specialists, notably Pulasth Roodurmun, have shown that it was Mandana Mishra, not Shankara, who occupied the intellectual reference place of non-dualist Vedanta until the 10th century^[54] — which matches Matthew Clark's finding that Shankara, absent from Buddhist and Jain sources and from the great philosophers of the 9th-10th centuries, long remained a minor figure^[55]. This finding overturns the popular representation, which spontaneously presents Shankara as having immediately dominated the Indian philosophical landscape in his lifetime.

Vidyaranya and the fabrication of the digvijaya (14th century)

The decisive turning point in the construction of Shankara's legend came in the 14th century, with the theologian-minister Vidyaranya (twelfth Jagadguru of Sringeri from 1380 to 1386, also an influential minister of the Vijayanagara Empire)^[56]. The German Indologist Paul Hacker, whose works profoundly renewed Advaita historiography, showed that it was Vidyaranya who first presented Shankara as a "divine folk-hero who spread his teaching through his digvijaya ('universal conquest')" across the whole of India, like a victorious conqueror^[57]. This epic narrative answered a precise need of the time: in a context of intense Hindu-Muslim conflict on the Deccan plateau, Vidyaranya sought to give Brahmanical Hinduism a unifying founder and an institutional organization capable of rivalling the perceived cohesion of Islam^[58].

It is likewise to this late period that the retrospective attribution to Shankara of the foundation of the four cardinal mathas dates back, according to Hacker and other scholars — whereas nothing, in Shankara's own authentic works, mentions such an institutional project^[59]. The historian Matthew Clark adds that several other Hindu monastic and ekadandi traditions historically remained outside the Dashanami organization which legend attributes to Shankara^[60].

The four mathas and the Dashanami order

Whatever the exact historical origin of this organization, the four mathas of Sringeri, Dvaraka, Puri and Jyotirmath, together with the Dashanami ("of the ten names") monastic order, today constitute a living institutional reality of Brahmanical Hinduism, each led by a Shankaracharya successor perpetuating the legendary founder's title^[61]. "Many lineages claiming descent from Shankara continue to flourish today"^[62], proof that the late construction of the legend did not prevent it from producing, over time, a solid and lasting institutional reality.

Shankara today: a national icon

In the 19th and 20th centuries, Indian neo-Vedantins and Western orientalists gave Advaita Vedanta a disproportionate place relative to its real diffusion in popular Hindu piety, erecting it as the "unifying theological thread of Hinduism" and as an emblematic representation of Indian religion and culture, "despite the fact that most Hindus do not adhere to Advaita Vedanta"^[63]. Swami Vivekananda, whose resounding address at the World's Parliament of Religions in Chicago in 1893 marks a turning point in the Western diffusion of Hinduism, belongs to this universalist vein of reading, as does his master Ramakrishna. More recently, in the 21st century, in the context of the rise of Hindu nationalism carried by the Bharatiya Janata Party, Shankara has been presented as a "national symbol of unity"^[64]: on 5 November 2021, Prime Minister Narendra Modi inaugurated a statue of Shankara at the Kedarnath shrine^[65], and on 21 September 2023, the government of Madhya Pradesh unveiled at Omkareshwar a "Statue of Oneness" one hundred and eight feet high^[66]. This contemporary political use, whatever its motives, must not however obscure the properly philosophical and spiritual question raised by Shankara's doctrine — the question to which this article now turns.

What the Church can recognize

A Catholic can recognize, in Shankara's approach, several traits deserving real esteem: the demand for an ultimate truth, unsatisfied with appearances or mere ritual comfort; the ascetic discipline of renunciation; the patient analysis of consciousness and its illusions; and the refusal to identify the divine with a mere psychological or social projection. The Second Vatican Council, in its declaration Nostra Aetate (28 October 1965), sets the general theological framework for appreciating such convictions without rejecting them wholesale, speaking precisely of Hinduism: "Thus in Hinduism, men contemplate the divine mystery and express it through an inexhaustible abundance of myths and through searching philosophical inquiry"^[67]. The same text concludes, a few lines further, with a principle applying directly to the Catholic reading of Advaita metaphysics: "The Catholic Church rejects nothing that is true and holy in these religions. She regards with sincere reverence those ways of conduct and of life, those precepts and teachings which, though differing in many aspects from what she holds and sets forth, nonetheless often reflect a ray of that Truth which enlightens all men"^[68].

This magisterial openness echoes the patristic doctrine of the "seeds of the Word" (semina Verbi), taken up by the 1965 decree Ad Gentes, according to which elements of truth and goodness can be found, sown by Providence, in the great religious traditions of mankind, to be recognized, purified and fulfilled in Christ^[69]. Shankara's intuition that the sensible world, taken for itself and cut off from its source, cannot satisfy the human desire for absolute truth and happiness, is not foreign to the biblical teaching on the vanity of idols and of created things separated from their Creator (Ecclesiastes 1:2; Ps 115:4-8).

A real metaphysical intuition, but an irreducible monism

This real esteem must never, however, obscure what, in Shankara's very doctrine, decisively separates Advaita Vedanta from the Catholic faith. The breaking point is not secondary: it concerns the very definition of God and of the creature.

An Absolute with no Trinity and no Persons

Shankara's brahman, in its ultimate reality (nirguna, "without attributes"), is neither personal, nor relational, nor Trinitarian: it is a pure, non-intentional consciousness, without a second^[70]. The Catholic God, conversely, is a communion of distinct Persons: "The Trinity is One. We do not confess three Gods, but one God in three persons, the 'consubstantial Trinity' [...] The divine persons do not share the one divinity among themselves but each of them is God whole and entire"^[71]. Where Shankara can conceive personal plurality only at the provisional level of Ishvara — the "lower Brahman qualified by attributes"^[72], a mere pedagogical concession to minds still mired in ignorance — Christianity affirms on the contrary that the plurality of Persons belongs to God's very being, at his most ultimate and not his most provisional level.

Real creation, not emanation or appearance

The Catholic doctrine of creation affirms that God brings the world into existence from nothing (creatio ex nihilo), needing no pre-existent matter: "We believe that God needs no pre-existent thing or any help in order to create. Nor is creation any sort of necessary emanation from the divine substance. God creates freely out of nothing"^[73]. This formula historically targets the ancient cosmologies of emanation, but it also illuminates, by contrast, the difference with the doctrine of maya: for Shankara, the world is, at the ultimate level, neither really created nor really distinct from Brahman — it is an appearance (vivarta) with no ontological reality of its own, comparable to the snake illusion on the rope^[74]. The Catholic faith, conversely, holds that the created world, though radically dependent on God, possesses a genuine reality distinct from its Creator — the creature is not an illusion to be dispelled by knowledge, but a gift truly received, called to glory and not to dissolution.

The Incarnation: God coming to matter, not the reverse

Advaita monotheism, radical as it is in its search for the One, ignores by construction the very idea of an Incarnation: a God who, without ceasing to be God, would really assume a complete human nature, body and soul, at a precise point in history. For Shankara, matter and individuality belong, on the contrary, to the domain of ignorance to be overcome through liberating knowledge — never to a place which ultimate Reality would freely choose to assume out of love. Christianity confesses an inverse and radically different movement: it is not man who rises, through knowledge, to the dissolution of his individuality in the impersonal Absolute, but God himself who "became flesh" (Jn 1:14) and "emptied himself, taking the form of a servant" (Phil 2:7), to join man in his concrete carnal and historical condition.

The experience and drift of Abhishiktananda

The case of the French Benedictine monk Henri Le Saux, who became in India the sannyasi Abhishiktananda (1910-1973), illustrates both the fruitfulness and the real danger of too hasty a dialogue between Christian and Advaita experience. Coming to India in 1948 and co-founding with Jules Monchanin the Christian ashram of Shantivanam (founded in 1950), he sought all his life to experience advaita personally in the lineage of the Hindu sage Ramana Maharshi (whom he visited at Tiruvannamalai in January 1949), while remaining a Catholic monk faithful to his ordination^[75]. His spiritual itinerary, marked by growing tension between the non-dual mystical experience he sought and the Trinitarian dogmatic framework of his own faith, provoked, in his lifetime and after his death, serious theological debate on the possibility — and the limits — of an authentic "Christian Advaita experience". His case remains a concrete pastoral warning: personal engagement in Advaita meditation techniques, even conducted with purely Christian intention and considerable erudition, carries a real risk of doctrinal slippage towards a form of monism incompatible with Trinitarian faith — precisely the risk which the magisterial letter examined in the next section takes care to name explicitly.

What the Magisterium says about Eastern meditations

In 1989, the Congregation for the Doctrine of the Faith, then headed by Cardinal Joseph Ratzinger, published a letter to the bishops entitled Orationis Formas, specifically devoted to the theological evaluation of Eastern-inspired meditation methods adopted in some Christian circles. The text first acknowledges the legitimacy of the spiritual interest driving some Christians towards these methods: "The interest which forms of meditation linked to certain Eastern religions and their particular ways of prayer have aroused in recent years, even among Christians, is a non-negligible sign of this need for spiritual recollection and deep contact with the divine mystery"^[76]. But it explicitly warns against the doctrinal confusion such dialogue can produce: concerning the imageless and conceptless absolute "proper to Buddhist theory", the letter notes that "others do not hesitate to place the imageless and conceptless absolute, proper to Buddhist theory, on the same level as the majesty of God, revealed in Christ"^[77] — a warning which holds, by identity of structure, for the attributeless absolute (nirguna Brahman) of Advaita; and it more generally denounces those who "propose abandoning [...] the very idea of the one and triune God, who is love, in favour of immersion 'in the indeterminate abyss of divinity'"^[78].

The point most directly opposed to Shankara's central thesis — the pure identity of Atman and Brahman — is formulated unambiguously in paragraph 14 of the same document:

"[...] that an absorption of the human self in the divine self will never be possible, not even in the highest states of grace" — Congregation for the Doctrine of the Faith, letter Orationis Formas, 15 October 1989, § 14^[79]

This sentence, written in a precise pastoral context (that of Christians tempted to adopt Eastern meditation techniques without discernment), condenses into one dense formula the fundamental doctrinal disagreement between Catholic mysticism and Advaita metaphysics: whatever the degree of union attained through grace and contemplation, Catholicism excludes, on principle, any fusion abolishing the distinction between creature and Creator — precisely what Shankara holds to be the very accomplishment of liberation.

Why Atman-Brahman identity cannot be true for a Catholic

A clear synthesis must name the three reasons why a Catholic cannot, without renouncing the essentials of his faith, adopt the Advaita thesis of the pure identity between soul and Absolute.

First, this identity erases the real distinction between Creator and creature, which the whole of classical Catholic metaphysics — from Saint Thomas Aquinas to the Catechism's theology of creation — holds on the contrary to be the very condition of possibility of genuine love between two really distinct terms: one does not love that with which one is numerically identical. Second, it makes the doctrine of the resurrection of the body impossible, the ultimate hope of Christianity. For Shankara, liberation consists in leaving the cycle of rebirths (samsara) through the dissolution of individuality in the undifferentiated ocean of Brahman; for Catholicism, the final hope is not dissolution but resurrection, in which God "will definitively grant incorruptible life to our bodies by reuniting them with our souls, by virtue of the resurrection of Jesus"^[80] — the human person, in his concrete singularity and glorified body, subsisting forever before God, not melted into him. Third, it empties of meaning the unique mediation of Christ. If salvation consists, in the last analysis, in an intellectual self-recognition of an already accomplished identity, the Cross, the Resurrection and the sacraments become, at best, provisional pedagogical aids — never the central saving event confessed by the Christian faith: "there is one God, and there is one mediator between God and men, the man Christ Jesus" (1 Tim 2:5).

Shankara remains a considerable intellectual figure: a young ascetic, dead at thirty-two according to tradition, who built, with remarkable dialectical rigour, one of the most coherent and radical metaphysics ever elaborated in response to the enigma of consciousness and human suffering. His life and work challenge Christians on one precise point: do we too take seriously the demand for an ultimate truth satisfied neither by idols, nor by the comfort of appearances, nor by purely outward religiosity? Shankara's asceticism, his intellectual discipline and his tireless search for what endures beyond impermanence are a silent challenge to any Christian faith content with a lukewarm Christianity, devoid of real contemplative depth.

But where Shankara proposes, at journey's end, the dissolution of the individual soul in an impersonal Absolute without a second, Christians receive in Christ a hope of a wholly different order: not the erasure of the person, but his communion with a God himself personal and Trinitarian; not fusion in a faceless Brahman, but the glorious resurrection of a body and soul remaining, eternally, those of a loved and loving "I"; not a self-sufficient knowledge dispelling illusion by its own powers, but a salvation freely received from a unique Mediator, God made man, who shed his blood so that each human person, in his irreducible singularity, may abide forever before the face of God. That is why the Church, while recognizing the austere greatness of Shankara's quest, can proclaim only one Name given to men by which to be saved (cf. Acts 4:12).

• Stanford Encyclopedia of Philosophy, article "Śaṅkara" — the most rigorous academic synthesis on Shankara's dating, authentic works and philosophical doctrine.
• Sengaku Mayeda, A Thousand Teachings: The Upadeśasāhasrī of Śaṅkara, State University of New York Press, 1992 — the reference annotated translation of Shankara's sole undisputed treatise of his own composition.
• Matthew Clark, The Daśanāmī-Saṃnyāsīs: The Integration of Ascetic Lineages into an Order, Brill's Indological Library, 2006 — the reference study on the late historical construction of the monastic order attributed to Shankara.
• Richard King, Indian Philosophy: An Introduction to Hindu and Buddhist Thought, Edinburgh University Press, 2002 — a critical evaluation of Shankara's real place in the history of Indian thought.
• Congregation for the Doctrine of the Faith, letter Orationis Formas on some aspects of Christian meditation, 15 October 1989 — the magisterial framework for Catholic discernment on Eastern meditation methods.
• Second Vatican Council, declaration Nostra Aetate (1965) and decree Ad Gentes (1965) — the magisterial framework for the Catholic view of non-Christian religions.