Cultures and religions meet each other worldwide. The exchange between them is becoming increasingly natural, and their role in promoting peace is becoming clearer. Can Christians still say, "Only Jesus Christ is the reason for the salvation of humanity"? Must Christianity abandon its claim to truth in order to be modern and tolerant? A world-renowned theologian demonstrates that a respectful coexistence of religions, faith and dialogue, freedom and tolerance are equally dependent on the crucial question: "What is actually true?" Joseph Ratzinger, in his characteristic intellectual brilliance, shows why encounter and dialogue inevitably confront us with the question of truth. It is a call for a reflective coexistence of religions, without giving up one's own understanding.