In this penetrating critique of twentieth-century theological currents, Joseph Cardinal Siri confronts the intellectual movements that, in his view, have obscured objective truth and unsettled Catholic doctrine. Examining trends such as relativism, modernism, and historicism, he analyzes the writings of influential thinkers and warns against interpretations that dilute divine revelation or reduce Christ to a merely human figure. With philosophical rigor and pastoral urgency, he reaffirms the necessity of dogma, the reality of Original Sin, and the Church’s role as the Mystical Body of Christ. This reissued work calls readers to fidelity, clarity, and steadfast adherence to the truths entrusted to the Church.