Peace

The constant temptation when speaking of peace is to define it negatively: peace would be when there is no war. The Church resolutely rejects this definition. The Second Vatican Council states clearly in Gaudium et Spes that peace “is not merely the absence of war”, nor is it reduced to “the balance of opposing forces” or a “despotic domination”^[2].

More than the absence of war

An absence of war can mask massive injustice. A people crushed under tyranny may know no war, but they do not know peace either: they suffer an order imposed by fear. That is why the Catechism immediately specifies what peace requires positively:

“Peace cannot be obtained on earth without the safeguarding of the goods of persons, free communication among human beings, respect for the dignity of persons and peoples, and the assiduous practice of fraternity.”
— Catechism of the Catholic Church, § 2304^[3]

Authentic peace is therefore linked to a cluster of realities: the security of persons and their goods, freedom of communication and relationship, respect for the dignity of each person and peoples, and the daily exercise of fraternity. Where these realities are lacking, even in the silence of arms, peace is not yet present.

“The tranquility of order” (Saint Augustine)

The densest formula, taken up by the Catechism, comes from Saint Augustine. In The City of God, the Bishop of Hippo reviews all the degrees of creation — the body, the soul, the household, the city, up to the heavenly city — and shows that each has its own peace in the order proper to it. He then sums up all these forms of peace in a single definition: “Pax omnium rerum tranquillitas ordinis”, the tranquility of order^[4].

This definition is decisive: peace is not the absence of movement nor uniformity, but order — that is, the right disposition of beings according to their nature and end. And order presupposes justice, which gives each their due, and charity, which unites. Augustinian peace is therefore never a neutral calm: it is a good order, willed by God, to be received and built.

Work of justice, effect of charity

From this flows the dual formula that structures all social doctrine on peace: peace is the “work of justice” and the “effect of charity”^[5]. The two underlying biblical verses are constant in the magisterium. First Isaiah: “The fruit of justice will be peace” — opus iustitiae pax^[6]. Then charity, which “goes far beyond what justice can bring”^[7].

This articulation forbids two symmetrical errors. Reducing peace to justice alone leads to a cold, legalistic peace, quickly taken over by resentment; this was seen after many treaties which, by “doing justice”, sowed the next war. Reducing peace to a feeling of love, skipping the demand for justice, leads to a false reconciliation that covers injustice. Catholic peace holds both: justice lays the foundations, charity completes the building.

The social doctrine of peace does not fall from the sky of ideas: it is rooted in Scripture, where peace — the Hebrew shalom — is one of the great names of salvation.

Shalom: Wholeness, Covenant, and Salvation

The Hebrew word shalom does not primarily mean the absence of conflict, but wholeness: the integrity of a being, the completion of a work, health, prosperity, restored justice, harmony in relationships. Greeting someone with shalom is to wish them the fullness of God’s blessings. In the Old Testament, peace is a gift from God linked to the Covenant: it accompanies faithfulness to the Lord and is lacking when the people turn away^[8].

The prophets announce a universal messianic peace, where justice and peace embrace (Ps 85:11) and even weapons will be transformed into instruments of life:

“They shall beat their swords into plowshares, and their spears into pruning hooks; nation shall not lift up sword against nation, neither shall they learn war anymore.” — Isaiah 2:4^[9]

This hope culminates in the figure of the promised child, one of whose names is “Prince of Peace” (Is 9:5)^[10]. The Catechism directly connects this to Christ: “Earthly peace is the image and fruit of the peace of Christ, the messianic ‘Prince of Peace.’”^[11]

Christ, Prince of Peace

The New Testament fulfills this announcement in an unexpected way: peace is no longer only promised, it is a person. Saint Paul affirms this strongly to the Ephesians, regarding the reconciliation between Jews and Gentiles in Christ:

“For he himself is our peace, who has made us both one and has broken down in his flesh the dividing wall of hostility.” — Saint Paul, Letter to the Ephesians 2:14^[12]

The Catechism comments: “By his blood on the cross, he ‘killed the hostility in his own flesh,’ reconciled men with God, and made his Church the sacrament of the unity of the human race and its union with God.”^[13] The peace of Christ is therefore not a diplomatic technique: it springs from the Cross, where hatred is conquered by self-giving. This is why the Risen Lord greets his disciples with these words, distinguishing this peace from all worldly peace:

“Peace I leave with you; my peace I give to you. Not as the world gives do I give to you. Let not your hearts be troubled, neither let them be afraid.” — Jesus, Gospel according to Saint John 14:27^[14]

“Blessed Are the Peacemakers”

Between the gift received and the task to be accomplished, the Gospel places the beatitude of the peacemakers. Peace is not only to be passively received: it is made, it is worked for, and those who labor for it are declared children of God:

“Blessed are the peacemakers, for they shall be called children of God.” — Jesus, Gospel according to Saint Matthew 5:9^[15]

The Greek word eirènopoioi — “makers of peace” — clearly indicates that this is a work, not merely a peaceful temperament. The Catechism concludes its section on the preservation of peace with this same beatitude^[16], making it the spiritual driving force of all Christian commitment to peace.

In the 20th century, peace became one of the major axes of the Church’s social doctrine. The trauma of two world wars, the nuclear threat, and decolonization led the popes to deepen a social theology of peace whose milestones form a coherent tradition.

Leo XIII and Peace through Social Justice

From Rerum Novarum (1891), addressing the workers’ question, Leo XIII establishes a principle that applies to both international and social peace: a society divided by injustice cannot be at peace. Concord among classes is not achieved by struggle but by respecting the rights of each and social friendship^[17]. This is already the idea that peace is a work of justice — first applied to the world of labor.

Pacem in Terris: The Four Pillars (John XXIII)

The great reference text is the encyclical Pacem in Terris (“Peace on Earth”), promulgated by Saint John XXIII on April 11, 1963, a few months after the Cuban Missile Crisis and shortly before his death. The first encyclical addressed “to all men of good will” and not only to Catholics, it states that peace rests on four pillars: truth, justice, love, and freedom^[18].

“Peace on earth, the object of the deep desire of humanity of all times, can be founded and established only on the absolute respect for the order established by God.” — Saint John XXIII, Pacem in Terris, no. 1^[19]

The encyclical derives from the dignity of the person a whole structure of rights and duties, and calls for founding international authority on law rather than force. It remains the magisterial charter of peace, cited by all subsequent popes.

Gaudium et Spes 78: The Conciliar Definition

The Second Vatican Council reprises and fixes the doctrine in the pastoral constitution Gaudium et Spes (1965), whose no. 78 gives the now-classic definition:

“Peace is not merely the absence of war and does not consist solely in an equilibrium of forces between adversaries; nor does it result simply from a domination imposed by a despotic power. Peace is rightly called ‘the work of justice’ (Is 32:17).” — Second Vatican Council, Gaudium et Spes, no. 78^[20]

The Council adds that peace is “the fruit of an order inscribed in human society by its divine founder, and which must be realized by men ever thirsting for a more perfect justice,” and that it is also “the fruit of love, which goes far beyond what justice can provide.”^[21] Peace is therefore “never acquired once and for all, but always to be built.”^[22]

Paul VI: "Development, the New Name of Peace"

Saint Paul VI shifts the focus toward the development of peoples. In Populorum Progressio (1967), he coined a famous phrase that inseparably links peace to economic justice among nations:

“Development is the new name of peace. […] If development is the new name of peace, who would not want to work for it with all their might?”
— Saint Paul VI, Populorum Progressio, no. 87^[23]

He also established, in 1967, the World Day of Peace, celebrated every January 1st since January 1, 1968, as an occasion for the pope’s annual message on a theme of peace^[24]. The theme he chose for 1972 sums up the entire doctrine: “If you want peace, work for justice”^[25].

John Paul II: "Opus solidaritatis pax"

Saint John Paul II, a witness to totalitarianism and an architect of the peaceful fall of communism in the East, adds a decisive link. In Sollicitudo Rei Socialis (1987), he defines peace as the fruit of solidarity:

“Peace as the fruit of solidarity […]. The motto of the pontificate of my venerable predecessor Pius XII was: ‘Opus iustitiae pax,’ peace as the fruit of justice. Today one could say, with equal accuracy […]: ‘Opus solidaritatis pax,’ peace as the fruit of solidarity.”
— Saint John Paul II, Sollicitudo Rei Socialis, no. 39^[26]

In his messages for the World Day of Peace, he develops the triad that remains attached to his teaching: “There is no peace without justice, there is no justice without forgiveness”^[27]. Peace thus requires not only rendering justice but also breaking the cycle of vengeance through forgiveness—without which no lasting reconciliation is possible.

Benedict XVI and Francis: Truth, Fraternity, and “Artisanal” Peace

Benedict XVI reminds us that peace is founded on the truth of the human person and on the inseparable bond of charity and justice (Caritas in Veritate, 2009)^[28]. Pope Francis, in Fratelli Tutti (2020), emphasizes universal fraternity and the “artisanal” nature of peace: it is not decreed from above but patiently built, person by person, through dialogue and encounter:

“Social peace is laborious, artisanal. […] We can all collaborate, as artisans of peace, in this work.”
— Pope Francis, Fratelli Tutti, nos. 217-225^[29]

If peace is the work of justice and the effect of charity, it is not built by wishes but by precise conditions, which the Magisterium has consistently enumerated.

Justice and Respect for Rights

The first condition is justice, that is, the effective respect of rights and the fulfillment of duties. The Catechism lists among the structural causes of war “injustices, excessive economic or social inequalities, envy, mistrust, and pride that prevail among men and nations”^[30]. Conversely: “All that is done to overcome these disorders contributes to building peace and avoiding war”^[31]. Peace is therefore built upstream, through social justice, just wages, the universal destination of goods, and the fight against poverty.

Truth and Disarming Hearts

The second condition is truth: without truthful relationships, trust collapses and peace becomes impossible. The arms race, treated in detail in the article on the arms race, is denounced by the Catechism as “an extremely grave wound to humanity” that “harms the poor in an intolerable way”^[32]: accumulating weapons to ensure peace by deterrence is “a paradoxical way” which, far from eliminating the causes of war, “risks making them worse”^[33]. True security passes through the disarmament of weapons and, more profoundly, through the disarmament of hearts.

Forgiveness and Reconciliation

The third condition, properly Christian, is forgiveness. Justice alone, left to itself, can nourish resentment and call for vengeance. John Paul II stressed: “There is no peace without justice, there is no justice without forgiveness”^[34]. Forgiveness does not eliminate the demand for justice or reparation, but it breaks the cycle where each offense calls for another, making true reconciliation possible. Here charity surpasses justice without denying it.

Development and the Common Good

The fourth condition is integral development and the pursuit of the common good, both national and international. According to Paul VI’s formula, “development is the new name of peace”^[35]: a humanity where entire peoples are deprived of necessities cannot be sustainably at peace. World peace thus calls for solidarity among nations and an international authority serving the universal common good, as already requested by Pacem in Terris^[36].

Because everyone claims peace — including tyrants and aggressors — the Church carefully distinguishes true peace from its imitations.

The False Peace of Domination

The first counterfeit is peace imposed by force, the order of the strongest or the balance of terror. Gaudium et Spes explicitly rejects it: peace does not come “from despotic domination”^[37]. The Pax Romana of empires, the “peace” of totalitarian regimes that silence all dissent, are not peace but its caricature: an order without justice, and therefore without true tranquility of order.

The False Peace That Covers Injustice

The second counterfeit is false reconciliation: calling “peace” the act of turning a blind eye to lasting injustice, asking victims to remain silent in the name of harmony. This is the peace denounced by the prophet Jeremiah: “They say, ‘Peace, peace,’ when there is no peace” (Jeremiah 6:14)^[38]. A peace that sacrifices justice is only a reprieve.

Neither Warmongering Nor Disarmed Pacifism

Between two extremes, Catholic doctrine holds a middle way. Against warmongering, it reminds that war is always a failure and that peace is the norm. Against a pacifism that would abdicate all defense of justice and deliver the innocent to the aggressor, it upholds the right and duty of legitimate defense, strictly governed by the conditions of just war^[39]. Refusing to defend the innocent in the name of peace is not peace: it is abandonment. True peace is neither easy war nor passivity, but just order actively protected.

Social doctrine, in sound theology, never separates human effort from grace. Peace is both a task entrusted to men and a gift that only God can fully accomplish.

Prayer, Conversion, and the Eucharist

The Catechism reminds us that, “because of the evils and injustices caused by every war, the Church earnestly urges everyone to pray and act” for peace^[40]. Peace is asked for in prayer — “From famine, plague, and war, deliver us, Lord”^[41] — and received in the liturgy, where each Eucharist offers the sign of peace before Communion, a sign that the peace of Christ precedes and grounds the peace of men. It also presupposes the conversion of hearts: “Insofar as men are sinners, the danger of war threatens,” but “insofar as, united in love, men overcome sin, they also overcome violence”^[42].

The Peace of the Divine Will

At its deepest, peace is the fruit of the soul restored to God’s order. The spirituality of the Divine Will, transmitted to Luisa Piccarreta (1865–1947), precisely echoes the Augustinian definition: peace is the tranquility of order, and the disorder of the world arises from the human will torn away from the Divine Will. Jesus teaches her in terms that echo, almost word for word, the Augustinian formula taken up by the Catechism:

“Peace puts all passions in order. […] Purity of intention governs and corrects the virtues themselves, including obedience. It is like a maestro who directs the spiritual music of the soul.”
— Jesus to Luisa Piccarreta, The Book of Heaven, volume 5, May 11, 1903^[43]

When the soul says its fiat and lets the reign of God “come on earth as it is in Heaven,” the original order is restored within it, and from this inner order can radiate a peace that is not “as the world gives.” Thus social peace, the summit of doctrine, roots itself in the peace of the heart reconciled with God — for, according to the word of Saint Augustine that the Church has never ceased to meditate on, our heart is restless until it rests in Him^[44].

“Blessed are the peacemakers, for they shall be called children of God.”
— Jesus, Gospel according to Saint Matthew 5:9^[45]

Related Articles — For related topics treated in their own articles: just war, arms race, common good, solidarity, subsidiarity, dignity of the human person, universal destination of goods, political charity, totalitarianism, communism, and globalization.

Main Magisterial Sources — Catechism of the Catholic Church, §§ 2302-2317 (“The Safeguarding of Peace”); Second Vatican Council, Gaudium et Spes, nos. 77-90; John XXIII, Pacem in Terris (1963); Paul VI, Populorum Progressio (1967); John Paul II, Sollicitudo Rei Socialis (1987); Pontifical Council for Justice and Peace, Compendium of the Social Doctrine of the Church (2004), ch. XI “The Promotion of Peace”; Pope Francis, Fratelli Tutti (2020).