The Devotio moderna: A Spiritual Movement of the Middle Ages (c. 1374–1500)

A "modern devotion" born in the IJssel valley

The Latin expression devotio moderna denotes not a doctrine but a way of living the faith. The word moderna — "modern", "new" — does not mean the movement rejects tradition: on the contrary, it points to a return to the sources of primitive fervour, felt as new against the religious routine of the time^[1]. Contemporaries speak of the devoti, "the devout", and describe their ideal as a renewal of the heart.

The term itself was coined later by the movement's chroniclers, in particular Johannes Busch (1399–1480), a canon of Windesheim, in his chronicle of the congregation^[2]. It fixes the name of a current already widespread throughout the IJssel valley, the region of the present-day Netherlands where Deventer, Zwolle and Windesheim lie, as well as in the Rhineland and northern Germany.

Neither heresy nor mere piety: the meaning of the word

The Devotio moderna holds a middle ridge. On one side, it stands apart from the Rheno-Flemish speculative mysticism of the 13th and 14th centuries — Meister Eckhart, Tauler, Ruusbroec — judged too lofty, at times suspected of illuminism. On the other, it refuses a purely outward religion, made of mechanical practices without conversion of heart^[3].

Its originality lies in this middle way: an affective and practical spirituality, accessible to layfolk and clerics alike, ordered not to lofty extraordinary experiences but to the daily reform of the self. The Dutch historian Régnerus Richardus Post insists on this point: the Devotio moderna is neither a sect nor a revolutionary vanguard, but an effort of Christian seriousness within the Church, anxious for orthodoxy and obedience^[4].

A reaction to the 14th-century crisis of the Church

The Devotio moderna cannot be understood without the crisis that gave birth to it. The 14th century is one of the darkest in the history of the Christian West.

• The Avignon papacy (1309–1376) removes the See of Peter from Rome and increases papal taxation.
• The Western Schism (1378–1417) tears Christendom between two, then three rival popes.
• The Black Death (1347–1352) carries off nearly a third of Europe's population and shakes certainties.
• The clergy often appears ignorant, absentee or worldly; late scholasticism, in the eyes of the devoti, loses itself in school quarrels disconnected from spiritual life^[5].

Faced with this disarray, Groote and his disciples launch neither revolt nor schism. They propose a reform from below: transforming souls one by one, restoring fervour in modest communities, and awaiting from this ordinary holiness the renewal of the Church. In this, the Devotio moderna is an authentic fruit of the waning Christian Middle Ages, on the threshold of the dawning Christian Renaissance.

From brilliant student to the convert of 1374

Geert Groote — rendered in French as Gérard Groote, in Latin as Gerardus Magnus — was born at Deventer in 1340, into a rich patrician family^[6]. Orphaned at about ten by the plague, he pursued brilliant studies at the Sorbonne in Paris and then at Cologne, acquiring a vast culture in theology, canon law, medicine and even astronomy. Provided with lucrative ecclesiastical benefices, he first led the life of an ambitious, worldly cleric.

Everything changed around 1374. A serious illness, the influence of a Carthusian friend and contact with spiritual circles brought about a radical conversion. Groote renounced his benefices, withdrew for a time among the Carthusians of Monnikhuizen, near Arnhem — the austerity of the Carthusian Order would lastingly mark his ideal of interiority — and burned some of his books of "profane sciences"^[7].

"I resolve to order my life to the glory, honour and service of God, and to the salvation of my soul; so that no temporal good, nor bodily health, nor learning, nor office may turn me away from this end." — Geert Groote, Conclusa et proposita, non vota (Resolutions and intentions, but no vows), c. 1374^[8]

This formula — "resolutions, but no vows" — already announces the spirit of the movement: a demand for perfection without the juridical bond of the religious orders.

The itinerant preacher

Ordained deacon — he would always refuse the priesthood out of humility — Groote received from the diocese of Utrecht permission to preach. From 1379, he travelled the Netherlands as an itinerant preacher, drawing immense crowds at Deventer, Zwolle, Kampen, Amsterdam, Utrecht and as far as southern Holland^[9].

His burning preaching unsparingly denounced simony, the concubinage of clerics and the lukewarmness of the clergy. He also visited the great mystic Jan van Ruusbroec at the priory of Groenendaal, near Brussels, whose writings he translated: Groote thus bridges Flemish high mysticism and his own, soberer and more practical spirituality^[10].

Forbidden to preach, and death

Groote's success caused alarm. Targeted by the clerics he scourged, he saw his permission to preach revoked around 1383, when the bishop of Utrecht forbade preaching by mere deacons. Groote submitted and appealed to the pope, without bitterness^[11].

He died at Deventer on 20 August 1384, aged forty-four, carried off by the plague he had caught while nursing a sick man. His work spans only a few years, but he leaves a decisive disciple, Florent Radewijns, and an intuition that would structure the whole movement.

The Devotio moderna never froze into a single form. It is organised in three complementary branches, whose coexistence makes all its flexibility — and its canonical fragility.

The table below summarises this institutional architecture, from lay communities without vows to regularly constituted canonical monasteries.

The Brethren and Sisters of the Common Life

At the heart of the movement stand the Brethren of the Common Life (Fratres Vitae Communis). They share house, table and purse, holding goods in common, but pronounce no vows and follow no approved rule: they remain free to leave the community. They live by their work, above all the copying and binding of manuscripts — an activity that widely spreads good spiritual books — and later by teaching^[12].

The Sisters of the Common Life grew even faster: from the end of the 14th century, dozens of houses of devout women multiplied in the towns of the Netherlands, living by weaving and sewing. John Van Engen stresses that this organised female laity is one of the movement's great novelties, and one of the least understood by the authorities of the time^[13].

Florent Radewijns and the first house at Deventer

It is Florent Radewijns (c. 1350–1400), Groote's direct disciple and a vicar at Deventer, who institutionalised the master's intuition. Around 1381, he gathered in his own house — the Heer-Florenshuis — the first clerics sharing the common life, then organised separate houses for the brethren and for the sisters^[14].

Radewijns also wrote practical spiritual instruments, including a Tractatulus devotus ("little devout treatise") codifying the movement's interior exercises^[15]. A self-effacing man and patient organiser, he is the true architect of the structures Groote had only sketched.

The Windesheim Congregation (1387)

To place the movement beyond canonical suspicion, Groote had advised before dying that some of the disciples be attached to an approved order. His spiritual sons thus founded in 1387 a monastery at Windesheim, near Zwolle, following the Rule of St Augustine: they are canons regular, with vows and enclosure^[16].

Around Windesheim there formed from 1395 a congregation soon federating dozens of houses. By the end of the 15th century, the Windesheim chapter counted nearly a hundred monasteries, some eighty of them for men, spread across the Netherlands, the Rhineland and Germany. The canonical branch thus became the flagship of the Devotio moderna, ensuring its survival well beyond the fragile experiment of the Brethren of the Common Life.

A common life without vows: the canonical question

The great boldness of the Devotio moderna — living evangelical perfection without vows — is also its chief vulnerability. Medieval canon law hardly knew any intermediate state between the layman in the world and the religious bound by vows. To some eyes, the Brethren dangerously resembled the Beguines and Beghards condemned at the Council of Vienne (1311–1312)^[17].

Matthew Grabow's attack at the Council of Constance

The threat became frontal at the start of the 15th century. The Dominican Matthew Grabow drew up a series of propositions against the Brethren, maintaining that a religious common life without vows is illegitimate and that one cannot tend to perfection outside an approved order^[18]. Having failed with the bishop of Utrecht, he carried the case before the Council of Constance (1414–1418).

There the Brethren found a leading defender: the chancellor of the University of Paris, Jean Gerson (1363–1429), supported by Cardinal Pierre d'Ailly. Gerson showed that one may tend to Christian perfection without entering religion and that the common life of the devout is not only licit but laudable^[19]. Grabow's theses were finally condemned by Pope Martin V in 1419. The Devotio moderna thus obtained a decisive ecclesial recognition, securing its development.

The primacy of experience over speculation

The heart of the Devotio moderna is a conversion of the inward gaze. Rather than climbing the summits of speculative theology, the devout seeks to know himself, to acknowledge his sin and to let himself be transformed by grace. The famous maxim of the Imitation sums up the whole movement:

"I would rather feel compunction than know how to define it." — Thomas à Kempis, The Imitation of Christ, Book I, ch. 1^[20]

This preference for lived experience over concept is no crude anti-intellectualism: Groote and his disciples are cultivated men. It is a hierarchy of ends: knowledge has value only if it makes one better. "What good is it to you to reason profoundly about the Trinity, if you are not humble, and thereby displease the Trinity?" asks the Imitation^[21].

The method: lectio, meditatio, oratio

The Devotio moderna is also a practical pedagogy of the soul. The devout structure their day with regular spiritual exercises: meditated reading, morning and evening examination of conscience, affective prayer. The Carthusian Henry Eger of Calcar (1328–1408), Groote's friend, helped fix the classic sequence of methodical prayer: lectio (reading), meditatio (meditation), oratio (prayer), compunction of heart, then contemplatio^[22].

This method, which turns prayer into an ordered journey rather than an irregular impulse, is one of the movement's most lasting contributions: it will be found again, perfected, in the great modern spiritual schools.

The rapiarium, the devout's notebook

A characteristic and touching trait: each devout keeps a rapiarium — a personal notebook in which he copies out the sentences of Scripture, the Fathers and the saints that struck him, to ruminate on them through the day^[23]. Florent Radewijns himself composed one. These manuscript florilegia, made of carefully chosen quotations, are both an instrument of spiritual memory and the direct ancestor of meditation collections.

The Imitation of Christ itself bears the mark of this practice: at bottom, it is rapiarium sentences turned into a book, arranged for daily meditation.

Christocentrism and imitation of Christ's humanity

At the centre of all: Jesus Christ, and more precisely His suffering humanity. Where speculative mysticism readily rose toward union with the Godhead, the Devotio moderna constantly brings the gaze back to the concrete Christ of the Gospels — His poverty, His humility, His Passion — to imitate Him in ordinary life.

"He that followeth Me walketh not in darkness, saith the Lord. These are the words of Christ, by which we are admonished to imitate His life and manners, if we would be truly enlightened and delivered from all blindness of heart." — Thomas à Kempis, The Imitation of Christ, Book I, ch. 1^[24]

This practical Christology — following Christ step by step rather than speculating about Him — gives the movement its very name: not meditatio moderna, but devotio — a loving, concrete attachment to the person of the Saviour.

Thomas à Kempis and Mount St Agnes

The Imitation of Christ (De imitatione Christi) is the most illustrious literary fruit of the Devotio moderna. Its most probable author is Thomas Hemerken of Kempen, known as Thomas à Kempis (c. 1380–1471), born at Kempen in the Rhineland. Trained at the Deventer school of the Brethren of the Common Life, he entered the canons regular of Mount St Agnes (Agnietenberg), near Zwolle, where he spent nearly seventy years copying, writing and directing souls^[25].

It is in this cloister that the four treatises making up the Imitation were written, c. 1418–1427, first circulated separately, then brought together.

Four books for the interior life

The work is divided into four books of unequal length, leading the reader from renunciation of the world to eucharistic union:

Book III, the longest, takes the form of an intimate dialogue between Christ and the disciple: it is the summit of the book, where the voice of Jesus instructs, consoles and corrects the soul. Book IV culminates in eucharistic adoration — a sign that all this interiority issues in the sacraments of the Church, not in an individualistic quietism.

The most widely read book after the Bible

The success of the Imitation is without equivalent in the history of the Christian book. Translated into hundreds of languages, constantly reprinted since the editio princeps of Augsburg (c. 1471–1472), it is regularly presented as the most widely circulated work in all Christendom after Holy Scripture^[26]. The French translation alone by Pierre Corneille (1656) is said to have run to more than two thousand editions.

Its fortunes cross centuries and sensibilities. St Thérèse of the Child Jesus knew it almost by heart:

"For a long time I sustained my spiritual life with the pure wheat contained in the Imitation. This little book never left me; in summer I had it in my pocket, in winter in my muff." — St Thérèse of Lisieux, Story of a Soul, Manuscript A^[27]

The quarrel over authorship

The text's original anonymity fed a famous quarrel over authorship from the 17th to the 19th century. Besides Thomas à Kempis, the chancellor Jean Gerson was proposed, and above all a mysterious Italian Benedictine abbot, Giovanni Gersen of Vercelli, championed out of patriotism by Italian and French scholars^[28]. Contemporary criticism attributes the work very largely to Thomas à Kempis, several autograph manuscripts of whom carry the text. The quarrel itself testifies to one thing: so many nations wanted to claim its paternity that the book had become a common good of Christendom.

Deventer, Zwolle and the school network

The Devotio moderna would never have shone so widely without its network of schools. The Brethren of the Common Life became educators: they ran boarding houses, watched over pupils' morals, copied textbooks and provided teaching at once rigorous and pious. The Latin schools of Deventer and Zwolle became among the most renowned in northern Europe^[29].

At Deventer, the rector Alexander Hegius introduced the study of ancient Greek; at Zwolle, John Cele made the town school, in connection with the Brethren, a pedagogical centre of the first order. These establishments united the new humanist culture with the movement's inward piety — proof that the Devotio moderna is not hostile to knowledge, but to the pride of knowledge.

Pupils who became famous

Passage through these schools or their influence marked figures of the very first rank:

• Nicholas of Cusa (1401–1464), future cardinal, philosopher and theologian, trained young at Deventer.
• Erasmus of Rotterdam (c. 1467–1536), the prince of humanists, a pupil of the Brethren at Deventer and then at 's-Hertogenbosch — he would keep a mixed, but lasting, memory of it.
• Adrian of Utrecht, the future Pope Adrian VI (1459–1523), the last non-Italian pope until John Paul II, trained at Zwolle.
• Wessel Gansfort (c. 1419–1489), renowned theologian, likewise a product of this milieu.

This educational fruitfulness explains why the Devotio moderna, a movement of spirituality, weighed so heavily on Europe's intellectual history: it formed the men who would make the Christian Renaissance and the debates of the 16th century.

From the Devotio moderna to the Exercises of St Ignatius

The movement's most spectacular legacy passes through Spain. At the abbey of Montserrat, the Benedictine abbot García Jiménez de Cisneros (1455–1510) systematised, in his Ejercitatorio de la vida espiritual (1500), the method of meditation inherited from the Devotio moderna^[30]. And it is precisely at Montserrat that St Ignatius of Loyola made his retreat in 1522, at the threshold of his conversion.

Ignatius read and reread the Imitation of Christ, which he would recommend all his life. His Spiritual Exercises, matrix of the Society of Jesus, take up and perfect the ordered pedagogy of the soul — examination, methodical meditation, election — whose foundations the Devotio moderna had laid. Through this channel, the "modern devotion" of the Netherlands irrigates the whole Catholic reform of the 16th century.

Influence on the Catholic reform and on the Protestant Reformation

The movement's influence is, strikingly, shared by both camps of the great 16th-century confrontation.

On the Catholic side, the Devotio moderna nourished the spirituality of interiority that would culminate in the Catholic Counter-Reformation and the Council of Trent: a return to personal prayer, formation of the clergy, primacy of the conversion of heart.

On the Protestant side, historians have stressed that Martin Luther, trained by the Brethren of the Common Life at Magdeburg, kept all his life an esteem for this inward piety and for the Imitation. But it must not be made into a "pre-Reformation": the Devotio moderna remained profoundly Catholic, attached to the sacraments, the hierarchy and obedience, as R. R. Post showed against Protestantising readings of the movement^[31]. It prepares the renovation of the Church from within, not its rupture.

What the Devotio moderna leaves to the Church

At the end of this journey, what remains of the "modern devotion"? Three lasting legacies.

First, a conviction: holiness is not reserved for cloisters or exceptional mystics; it is offered to the ordinary Christian who humbly imitates Christ in daily life. This intuition of a spirituality accessible to all foreshadows from afar the universal call to holiness the contemporary Church would reformulate.

Second, a method: ordered prayer, examination of conscience, meditated reading, which shaped centuries of Catholic interior life.

Finally, a book: the Imitation of Christ, which continues, six centuries later, to accompany souls. The movement's whole programme is contained in one of its most famous sentences:

"Vanity of vanities, all is vanity, save to love God and serve Him alone." — Thomas à Kempis, The Imitation of Christ, Book I, ch. 1^[32]

• The Christian Renaissance (15th–16th century) — the great cultural and spiritual renewal the Devotio moderna helped prepare.
• The Protestant Reformation (1517–1555) — to distinguish the movement's Catholic spirit from the 16th-century rupture.
• The Catholic Counter-Reformation (1517–1648) — the renovation of the Church of which the "modern devotion" is one of the roots.
• The Foundation of the Society of Jesus (1521–1556) — the legacy of the Imitation in the Exercises of St Ignatius.
• The Carthusian Order — the Carthusian austerity that marked Geert Groote's conversion.
• The University of Paris and Scholasticism — the learned speculation to which the devout opposed interiority.