On October 4, 1965, Paul VI visits the United Nations. He is the first Pope to take this step, paving the way for his successors. In 1965, in a time of cold war, this really represents a great novelty. Pope Montini is aware of the turning point and the new scenarios that open up. In the introductory essay, the author points out that the visit was an opportunity to address the Church's message not only to the rulers but to the world. Since then, the relationship between the Pontiff and the governments of the nations will no longer be the same. Paul VI speaks to the UN on behalf of the Council, just opened in Rome, at a time of profound changes for contemporary Catholicism. The central message of the Pope's speech to the United Nations, which is still very current, is "no to war". The slim man in white thinks he has this authority: "we are experts in humanity," he says, and he proposes Peace with determination. In the appendix the volume shows the manuscript speech of the Pope, the transcription with the diplomatic corrections and, finally, the official text.