The Catholic Church advocates just peace not as a slogan or “absence of war,” but as a lived reality grounded in Christ, built through justice and forgiveness, and advanced through truthful dialogue, disarmament of heart, and structures of integral development. The Church’s public voice often appears in high-level addresses and global social teaching that call for peace to be pursued through responsible governance, respect for human dignity, and strengthened international cooperation.1 2 3 4

1) Theological foundation: peace comes from Christ, and is inseparable from justice

Pope Leo XIV stresses that peace has to be more than an idea, contract, or moral principle. The “firm foundation” for persevering in peace is Christ himself, “in him is our peace; from him we draw our peace.”1 Peace is therefore not merely strategic—it is spiritual and moral, rooted in the divine source of reconciliation.1

Crucially, he also links peace to justice and forgiveness through a line attributed to St. John Paul II: “no peace without justice, no justice without forgiveness.”1 In this framework:

• Forgiveness is not optional “sentiment”; it is ordered toward justice, which then becomes a foundation for peace.1
• Peace is “not authentic if it is the product of partisan interests,” implying that a Catholic approach rejects peace as mere compromise without moral truth.1
• The Gospel rule of charity (“do to others what you would like them to do to you,” cf. Mt 7:12) anchors peace in concrete ethical reciprocity.1

This theological logic resonates with Pope Francis’s insistence that peace cannot be reduced to external calm: peace is “fashioned by efforts directed day after day” toward the “ordered universe willed by God,” which includes “more perfect justice among men.”4 Where peace is not produced through integral development, “it will always spawn new conflicts and various forms of violence.”4

2) Just peace as an active process: dialogue, truthful speech, and “disarming” the heart

A distinctive Catholic emphasis in advocating just peace is that it is active and demanding, not passive. Pope Leo XIV describes peace as “first and foremost a gift” from Christ (“My peace I give to you”), yet one that is “active and demanding.”3 It is built “in the heart and from the heart,” through eliminating pride and vindictiveness and choosing words carefully.3

He also underlines that words can wound and kill—so authentic peacemaking requires truthful, prudent speech and resistance to divisive rhetoric.5 In an address to diplomats, he calls for “hope to disarm proclamations and speech,” insisting on honesty and prudence, and urging “words that do good,” “build understanding,” and “repair wrongs and forgive offences.”5 The practical implication is that advocacy for just peace includes:

• De-escalation through language (not just through policy),5
• Dialogue without fatigue (“Those who tire of dialogue tire of hoping for peace”).5
• Religious and interreligious dialogue as a contribution to peace, which requires full respect for religious freedom.3

His message for the World Day of Peace explicitly frames the goal as an “unarmed and disarming” peace, beginning with an “internal disarmament of heart, mind and life.”2 This provides a Catholic bridge between spiritual conversion and external peace-building: the path to “beat their swords into plowshares” (cf. Is 2:4-5) begins within persons and then extends to peoples and nations.2

3) Social and moral criteria: peace requires integral development, human dignity, and a prophetic defense of justice

Catholic advocacy for just peace is inseparable from social teaching about the common good. Pope Francis warns against peace conceived as “pacification” or a cover for injustice—peace cannot be a pretext to silence the poor or maintain privilege.6 When wealth and comfort try to suppress demands for justice, “a prophetic voice must be raised.”6

This matters for just peace because it clarifies what “justice” includes. It is not merely legal procedure, but the moral demand that human rights and concern for the poor cannot be postponed behind a “transient peace.”6 In short: a peace without justice is fragile and morally defective.6

Pope Leo XIV similarly grounds peace in the dignity of every person, “especially the most frail and vulnerable, from the unborn to the elderly… citizens and immigrants alike.”3 He also emphasizes that governments have the responsibility to build harmonious civil society by investing in the family and ensuring respect for human dignity.3

4) Public action and international dimensions: cooperation, multilateralism, and disarmament of instruments of destruction

The Catholic Church’s advocacy for just peace is not limited to internal moral exhortation; it explicitly engages the international sphere.

Pope Leo XIV calls for:

• Multilateral diplomacy and revitalizing international institutions designed to remedy disputes in the international community.3
• A “resolve to halt the production of instruments of destruction and death,” because peace is “possible without true disarmament” and without sliding into a “race to rearmament.”3
• Rooting peace in efforts to “eliminate the root causes of all conflicts and every destructive urge for conquest.”3

In addition, his address on diplomacy highlights the relationship between peace and justice as shared duties of humanity—peace is “the duty that unites humanity in the common quest for justice.”5 This echoes the Church’s broader view that peace requires both moral conversion and credible institutional commitment.

5) How “just peace” functions within Catholic teaching: not a denial of defense, but a prioritization of reconciliation and justice

The Church’s magisterial voice frequently centers on peace-building through justice, truth, dialogue, and reconciliation rather than focusing narrowly on military categories. For example, Pope Leo XIV’s framing privileges:

• peace rooted in Christ,1
• forgiveness leading to justice,1
• disarmament of heart and language,2 5
• and international cooperation with disarmament of destructive instruments.3

Even when questions of defense arise in Catholic thought, the dominant thrust in the sources provided here is that peace must be pursued through truthful, just, and reconciliatory means—so that peace is not the fruit of domination, but the result of moral repair and social order.4 6

A scholarly analysis provided alongside these documents notes that contemporary Catholic discourse about peace tends to emphasize truth, justice, and charity—while also affirming that legitimate defense, when it serves peace, has a place.7 While this is not itself magisterial teaching, it helps explain why Catholic “just peace” advocacy often appears as a broader peace agenda (development, rights, dialogue, institutions) rather than a solely war-focused discussion.7

Conclusion

The Church’s role in advocating for just peace is fundamentally reconciliatory and moral: peace flows from Christ, is sustained by justice and forgiveness, and is advanced through dialogue, truthful speech, and disarming the heart.1 2 5 At the same time, the Church insists that just peace must be socially concrete—requiring integral development, defense of human rights, and a prophetic refusal to treat injustice as “just peace.”4 6 Finally, the Church calls for international cooperation, multilateral diplomacy, and true disarmament, because lasting peace depends on both personal conversion and responsible global structures.3