The Syllabus of Pius IX (1864)

A pope in the midst of a revolutionary century

Pius IX was elected in 1846. At the beginning of his pontificate, he was regarded as an open-minded pope: he granted an amnesty, reformed certain pontifical institutions and aroused the enthusiasm of many Italian liberals. The revolution of 1848 changed everything. His minister Pellegrino Rossi was assassinated on 15 November 1848, the Roman Republic was proclaimed in 1849 and the pope had to take refuge in Gaeta. The revolutionary experience convinced Pius IX that the words “liberty” and “progress” could serve as a screen for a direct attack on the Church.^[9][10]

This experience was not merely personal. Across Europe, the modern States were attempting to take back from the Church education, marriage, religious property, the appointment of bishops and the oversight of religious congregations. The Syllabus must be read in this concrete context: it responds less to a philosophical abstraction than to a series of laws, newspapers, parliamentary speeches and administrative measures aimed at making religion socially invisible.

Quanta cura: the parent encyclical

The Syllabus accompanies Quanta cura, published the same day. The encyclical provides the key for reading it: in it Pius IX combats the opinions that seek to prevent the Church from freely exercising her mission “towards nations, peoples and sovereigns”, and to abolish cooperation between the priesthood and civil authority.^[11]

The decisive passage targets naturalism applied to civil society. Pius IX condemns those who teach that a well-ordered society should be governed “without any regard for religion, as if it did not exist”, or at least without any distinction between the true religion and false ones.^[12] He also condemns the idea that liberty of conscience and worship is an absolute right allowing everyone to publish every opinion “by word, in print or otherwise”, without moral or religious limit.^[13]

“Liberty of conscience and of worship is a right proper to every man. This right must be proclaimed and guaranteed by law in every well-ordered society.” — Proposition condemned by Pius IX in Quanta cura, 8 December 1864^[14]

This sentence does not target the interior freedom to believe, nor the absence of constraint in the act of faith. It targets the liberal thesis that civil society has no duty towards the true religion and should treat religious error as an absolute natural right. It is this distinction that will later make it possible to understand the relationship between the Syllabus and Dignitatis humanae.

A “catalogue”, not a treatise

The Syllabus hardly argues at all. It enumerates. Each proposition is false, but it refers back to an earlier act in which Pius IX had already condemned or discussed it. The document thus functions as an analytical table of the magisterium of Pius IX against modern errors.^[15][16]

This form explains part of the scandal. A hostile reader can isolate one proposition and give it the harshest possible meaning. A Catholic reader must return to the source document, to the historical context and to the exact scope of the censure. Dupanloup said so as early as 1865: one must know what the pope actually condemned, not what his adversaries make him say.^[17]

From Spoleto to Rome: a long preparation

The Syllabus was not improvised. According to the classic historical notices, the idea of a catalogue of modern errors goes back to the provincial council of Spoleto of 1849, which asked Rome for a synthetic text against the new doctrines. In 1852, Pius IX entrusted Cardinal Fornari with drawing up a first list of twenty-eight errors. The project then passed through several commissions.^[18][19]

A decisive step came in 1860, when the Bishop of Perpignan, Philippe Gerbet, published a pastoral instruction on contemporary errors. His text, organised in eighty-five theses, impressed Pius IX and provided a framework for a new commission led by Cardinal Caterini. A list of sixty-one errors was presented in 1862 to a large group of bishops gathered in Rome for the canonisation of the Japanese martyrs.^[20][21]

The project then leaked into the Italian anticlerical press: the Turin weekly Il Mediatore published the wording and the theological qualifications of the theses. The political effect was explosive: the document seemed to confirm every accusation against Rome. Pius IX postponed promulgation and had the work taken up again. The final version would contain 80 propositions, far more soberly linked to the pope's already published acts.^[22][23]

Cardinal Antonelli's letter

The Syllabus was sent to the bishops together with a communication from the Cardinal Secretary of State Giacomo Antonelli. This detail matters: the document is a publication of the Holy See under the authority of Pius IX, but it was not signed as an encyclical. Its authority derives from its link with earlier pontifical acts and with Quanta cura, not from a solemn form of its own.^[24]

This point does not weaken the document; it situates it. The propositions of the Syllabus do not create a new doctrinal system in 1864. They condense earlier condemnations. Britannica aptly summarises that, since these errors had already been condemned in allocutions, encyclicals and apostolic letters, the Syllabus “said nothing new” in its doctrinal content.^[25]

The ten families of errors

The Syllabus groups the 80 propositions into ten broad sets. The following table gives an overview of the structure, useful for avoiding reducing the whole document to religious liberty alone.

The document is therefore not only political. It begins with God, reason, revelation, faith, Christ and miracles. The question of the State comes afterwards because an error about God produces an error about society: if God is no longer recognised as the source of truth and of the moral law, the State or the individual becomes the ultimate arbiter of the true and the good.

The most quoted propositions

Certain propositions have become emblematic. Proposition 15 condemns the idea that every man is free to “embrace and profess the religion he shall have judged true by the light of reason”. Proposition 16 condemns the idea that men can find “in the worship of any religion whatsoever” the way of salvation. Proposition 55 condemns the absolute separation of Church and State. Proposition 80 condemns the adaptation of the pope to “progress, liberalism and modern civilisation”.^[26][27]

These formulas are often used as slogans against the Church. But each must be read in its context. Proposition 15 does not condemn the sincere search for truth; it condemns a rationalist conception in which private reason becomes the sovereign judge of revelation. Proposition 16 does not deny that God can save persons outside the visible boundaries of the Church; it condemns indifferentism, according to which all religions are equally valid as ordinary ways of salvation. Proposition 55 does not settle every possible concordat or pluralist regime; it condemns the principle of an absolute separation that excludes God and the Church from public life.^[28][29]

The errors concerning the Church

Propositions 19 to 38 defend the proper rights of the Church. They refuse to define the Church as a mere human association, to derive her power from the State, to let the civil power define her rights, or to subject ecclesiastical authority to political judgment.^[30]

Leo XIII would develop this same doctrine in Immortale Dei. The Church, he writes, is a society “juridically perfect in its kind”, because she possesses by the will of her Founder the means necessary for her mission. That is why it belongs to the Church, not to the State, to judge what directly concerns religion and the salvation of souls.^[31]

“It belongs therefore to the Church, not to the State, to guide men towards heavenly things.” — Leo XIII, Immortale Dei, 1 November 1885^[32]

The Syllabus is therefore not an administrative nostalgia for the Papal States. It affirms a deeper truth: the Church is not a system of worship conceded by the State. She receives from Christ a mission prior and superior to political regimes.

What Pius IX condemns under the name of liberty

The word “liberty” is the main trap. In the liberal language of the nineteenth century, it can mean the absolute autonomy of the individual or of the State before God. In Catholic language, liberty is the capacity to adhere to the true and the good. Pius IX condemns the first, not the second.

Leo XIII would formulate the distinction with magisterial precision in Libertas. True liberty presupposes obedience to a supreme and eternal rule: the authority of God. When liberty detaches itself from God, it becomes licence. This is not rhetoric: if everyone becomes his own law, the objective distinction between good and evil disappears.^[33][34]

“Human liberty presupposes the necessity of obeying a supreme and eternal rule; and this rule is none other than the authority of God imposing upon us His commandments and prohibitions.” — Leo XIII, Libertas, 20 June 1888^[35]

The target of the Syllabus is therefore metaphysical liberalism, not every concrete civil liberty. The document does not say: “the more the State constrains, the better”. It says: “no human liberty can become an absolute against God”.

Error has no rights, but the person does

A classic formula sums up the doctrine: “error has no rights”. It can be true if it means that a false doctrine has no moral title to be preferred to the truth. It becomes dangerous if it is used to deny the rights of the person who is mistaken.

This distinction is already present in Dupanloup, who refuses to attribute to the Syllabus a universal apology for coercion. According to Bevenot's study, Dupanloup seeks to show that the pope did not condemn what no reasonable man would condemn, and that absolute propositions must be distinguished from relative situations.^[36] It would be fully formulated by Vatican II: truth obliges in conscience, but it imposes itself only by its own force.^[37]

“Truth imposes itself only by the force of truth itself, which penetrates the mind with gentleness as much as with power.” — Second Vatican Council, Dignitatis humanae, n. 1^[38]

The Catholic point is not that the State should coerce consciences. It is that civil society cannot build itself as if God, the true religion and the moral law did not exist.

Why education is central

In Quanta cura, Pius IX insists on the education of youth. The adversaries of the Church seek, in his view, to remove the clergy from teaching and to turn schooling into an instrument of formation without God.^[39] The question recurs in the Syllabus, notably when theses attributing to the State an unlimited power over schools and universities are condemned.

This point explains why the document sometimes appears political when it is first and foremost pastoral. For Pius IX, a society that cuts the child off from faith does not produce an innocent neutrality; it manufactures a conscience without supernatural bearings. The modern State is never totally neutral: if it does not form minds in truth, it often forms them in indifference.

Does the Syllabus condemn science?

No. The opening propositions condemn rationalism, not reason. They target the idea that human reason, “without any relation to God”, is the sole arbiter of the true and the false, of good and evil. They also condemn the idea that revelation is imperfect and subject to an indefinite progress of human reason.^[40]

Catholicism does not reject science. It rejects the transformation of the scientific method, legitimate in its own order, into a total philosophy. Pius IX does not condemn laboratories, mathematics, medicine or historical research; he condemns the rationalist dogma that there can be no revealed truth above natural reason.

Does the Syllabus condemn democracy?

The document does not condemn any determinate political form. It condemns rather the idea that political authority comes solely from the popular will, without reference to God, to the natural law and to the common good. Leo XIII would state explicitly in Immortale Dei that sovereignty is “not necessarily bound to any political form”, provided the regime serves utility and the common good.^[41]

This point is decisive. The Church does not impose monarchy as dogma. She imposes a doctrine of authority: all legitimate power must be ordered to justice, to the common good and to God. A democracy can be legitimate; a democracy that absolutises the majority against truth becomes tyrannical.

Does the Syllabus condemn all liberty of conscience?

No — if by liberty of conscience one means that the religious act cannot be imposed by force. Yes — if one means by it that everyone has a natural right to profess the true or the false indifferently, as if God could ask nothing of persons and societies.

Vatican II clarifies this distinction by defining religious liberty as immunity from coercion in civil society, not as a moral right to error. Dignitatis humanae affirms both that all men must seek the truth and that no one must be forced to act against his conscience in religious matters.^[42]

“This freedom consists in this, that all men should be free from all coercion [...] so that in religious matters no one is forced to act against his conscience.” — Second Vatican Council, Dignitatis humanae, n. 2^[43]

The Syllabus and Vatican II therefore do not speak of exactly the same object. Pius IX condemns a liberty conceived as independence from truth and as the religious neutralisation of society. Vatican II affirms a civil right not to be coerced, founded on personal dignity, within the limits of a just public order.^[44]

An expected media storm

The publication of the Syllabus provoked a sharp reaction in Europe. In Russia, in France and in the Italian States subject to Victor Emmanuel, the very publication of the document was forbidden, while Bismarck and other European statesmen declared themselves against it.^[45] Misunderstandings multiplied, above all because several propositions directly concerned the Italian situation: confiscation of Church property, suppression of religious orders, civil control of education and marriage, attack on the pope's temporal power.^[46]

Proposition 80 became the symbol of the crisis. Yet it refers back to the allocution Jamdudum cernimus of 18 March 1861, in which Pius IX criticises a very concrete “progress”: closure of religious houses, secularised education, political anticatholicism and the reduction of the Church to silence. Out of this context, the formula becomes a caricature.^[47]

Dupanloup: defending without minimising

Bishop Félix Dupanloup of Orléans published a defence of the Syllabus in 1865. His strategy was not to empty the document of its force, but to regulate its interpretation. He sought to show that the pope had condemned modern errors “in the very sense” in which they were false, not every possible civil liberty.^[48]

Bevenot emphasises that Dupanloup does not base his whole explanation on the “thesis/hypothesis” distinction, contrary to a persistent legend. He uses it little. His main argument is simpler: a precise condemnation cannot be turned into the absurd affirmation of its maximal opposite. Condemning an unlimited liberty to publish falsehood does not mean condemning every reasonable use of the press; condemning indifferentism does not mean seeking to coerce every conscience.^[49]

The success was considerable: no fewer than six hundred and thirty bishops wrote to congratulate him, and Pius IX himself honoured him with a brief, on 4 February 1865, recognising that he had refuted the calumnious interpretations of Quanta cura and the Syllabus.^[50][51]

Immortale Dei: the Christian constitution of States

Leo XIII does not disavow Pius IX. He makes things precise. In Immortale Dei (1885), he affirms that the State must take God as the rule of its government, that the Church possesses an authority of her own in religious matters, and that the two powers must be ordered according to their respective ends.^[52]

But he also brings a valuable political clarification: the Church does not bind her doctrine to a single form of government. What matters is not the regime as such, but its orientation to the common good and its respect for the rights of the Church.^[53]

Libertas: liberty is not licence

In Libertas (1888), Leo XIII gives the most complete formulation of the Catholic doctrine of liberty. He recognises the grandeur of human liberty, but attaches it to truth. Liberty is not the right to do anything; it is the responsible use of the will under the divine law.^[54]

The passage that best illuminates the Syllabus is the one on “liberty of conscience”. Leo XIII distinguishes two senses: if the expression means that everyone may indifferently render or not render worship to God, it is false; if it means that man may fulfil the precepts of God in the State without unjust hindrance, it is good.^[55]

This distinction already makes it possible to move beyond the modern false dilemma: either a coercive confessional State, or a neutral State that excludes God. Catholic doctrine seeks something else: a liberty ordered to truth, protected against unjust constraint, but not separated from the moral law.

The sensitive point: Dignitatis humanae

The best-known difficulty comes from Dignitatis humanae, the Second Vatican Council's declaration on religious liberty, promulgated on 7 December 1965. The Council affirms that the human person has a right to religious liberty, understood as absence of coercion in religious matters within civil society.^[56]

At first sight, the tension appears strong with propositions 15, 55 and 77-80 of the Syllabus. But the preamble of Dignitatis humanae itself gives the hermeneutical key. It affirms that religious liberty “leaves untouched” the traditional doctrine on the moral duty of man and of societies towards the true religion and the one Church of Christ.^[57]

In other words, Vatican II does not say: “the State has no duty towards God”. It says: “the State cannot coerce the religious act, and must recognise a civil right of immunity within just limits”. This is a development of doctrine on personal dignity and the juridical form of the modern State, not a canonisation of the indifferentism condemned by Pius IX.^[58]

The homogeneous development of doctrine

The International Theological Commission, in its 2019 document on religious liberty, explicitly speaks of a maturation of the Magisterium in understanding the relationship between the Church and the juridical form of the State. It notes that Dignitatis humanae manifests a progress in doctrinal unfolding, in a profoundly transformed political context.^[59]

This maturation does not mean rupture. It means that the Church distinguishes more precisely what belongs to the permanent principle and what belonged to a historical configuration: the duty towards truth remains; the refusal of unjust religious coercion is better formulated; the civil right to immunity from coercion receives an explicit anthropological foundation.

What the Syllabus keeps that is still current

The Syllabus remains current whenever modernity claims to replace God with the State, with the majority, with technology or with opinion. It recalls that reason without God easily becomes rationalism; that liberty without truth becomes licence; that the State without the moral law becomes arbitrary; that the Church without her own liberty becomes a tolerated cultural service.

It also remains current in its warning against indifferentism. Vatican II recognises civil religious liberty, but never says that all religions are equal. On the contrary, Dignitatis humanae begins by confessing that the one true religion subsists in the Catholic and apostolic Church.^[60]

Reading the propositions as technical condemnations

A proposition of the Syllabus is not a catechism sentence to be mechanically inverted. It is a historical error, often summarised, sometimes extracted from a precise debate. One must therefore ask: what exact thesis is condemned? In which earlier document had Pius IX dealt with it? What practical abuse was he targeting?

This principle avoids two symmetrical errors. The progressive error consists in rejecting the Syllabus as an embarrassing relic. The integralist error consists in turning it into a slogan against every later doctrinal development. In both cases, the document is no longer read as an act of the living Magisterium, but as a party weapon.

Not confusing practical neutrality with doctrinal neutrality

A pluralist State may, in certain circumstances, guarantee civil peace by juridically favouring no confession. But this practical neutrality must not become an absolute doctrinal neutrality, as if God did not exist, as if religious truth and falsehood were socially equivalent, as if the moral law depended only on the vote.

The distinction illuminates the present situation. A Catholic may defend the civil liberty of persons and religious communities against unjust coercion. He cannot defend the idea that society has no duty towards God, nor that error possesses the same moral title as truth.

Keeping Pius IX, Leo XIII and Vatican II together

The sound Catholic reading does not choose between Pius IX and Vatican II. It reads them within one and the same doctrinal history. Pius IX condemns liberal naturalism and indifferentism. Leo XIII clarifies true liberty and the Christian constitution of society. Vatican II affirms immunity from coercion and the dignity of the person in the civil order. Doctrine does not contradict itself; it distinguishes its objects better.

• The Modernist Crisis — the “new syllabus” of Saint Pius X, Lamentabili sane exitu (1907), continues the method of condemned propositions.
• The Papal States — for understanding the political context of Pius IX, from 1848 to the capture of Rome.
• The Capture of Rome in 1870 — the event that turned Pius IX into the “prisoner of the Vatican”.
• The Lateran Agreements — the settlement of the Roman Question in 1929.
• The Catechism of the Catholic Church — the current doctrinal synthesis on liberty, conscience and morality.