At this time when the world is torn apart by brutal conflicts, we share an excerpt from the famous book written by Igino Giordani in 1953 and republished in 2003: The uselessness of war. “If you want peace, prepare peace”: the political teaching that Giordani offers us in this volume can be summarized in this aphorism. Peace is the result of a plan: a plan of fraternity between peoples, of solidarity with the weakest, of mutual respect. Thus a more just world is built, this is how war is set aside as a barbaric practice belonging to the dark phase of the history of mankind.