In his first encyclical, Magnifica Humanitas, Pope Leo XIV presents a strong appeal for peace and argues that the traditional concept of “just war” must be reconsidered in today’s world. He warns that modern society is increasingly accepting war as a normal political tool, creating what he describes as a state of “permanent belligerence.”
While reaffirming the Church’s recognition of the right to legitimate self-defense, the pope stresses that modern warfare—especially in the nuclear age—has fundamentally changed the moral landscape. The destructive power of contemporary weapons, along with the frequent misuse of “just war” arguments to justify conflicts, makes it increasingly difficult to morally defend war as a solution.
Pope Leo emphasizes that humanity now possesses more effective alternatives for resolving disputes, including dialogue, diplomacy, forgiveness, and international cooperation. Rather than investing enormous resources in weapons and military industries, he argues that nations should focus on addressing humanitarian challenges such as poverty, hunger, and human suffering.
The encyclical also raises concerns about emerging military technologies, particularly artificial intelligence. The pope warns that technologies allowing attacks from a distance can weaken moral responsibility by making violence more impersonal and reducing human beings to mere targets or data. He calls for stronger international regulation to ensure that decisions involving the use of force remain under meaningful human control.
Drawing on the Church’s evolving teaching on war, the document reflects a broader movement within modern Catholic thought that increasingly views war as a failure of humanity rather than an acceptable means of achieving justice. Pope Leo’s message does not abolish the principle of self-defense, but it places far greater emphasis on peacebuilding and nonviolent solutions in an age of unprecedented destructive capability.
The central message of Magnifica Humanitas is clear: in a world equipped with advanced diplomacy, global institutions, and modern communication, the pursuit of peace must take precedence over the pursuit of military victory
