In his lecture, Bishop Williamson explores the dichotomy between the traditional teachings of the Catholic Church and the liberal ideologies that have infiltrated society over the past two centuries. He emphasizes the importance of understanding the encyclicals of the popes, especially those written in the last 200 years, as a means to grasp the Catholic Church's stance against the rising tide of liberalism. Bishop Williamson argues that modern liberalism, with its emphasis on the deification of man and the relegation of God to the sidelines, stands in direct opposition to the Catholic worldview, which places God at the center of the universe.

The lecture delves into the historical context of the Church's teachings, highlighting the shift in papal perspectives post-Vatican II and the contamination of the Church by modern liberal thought. Bishop Williamson criticizes the modern interpretation of liberty, particularly religious liberty, as corrupt and contrary to the Church's teachings. He points out the failure of Catholics to fully understand their faith, attributing this to a lack of catechism and proper religious education.

Bishop Williamson also touches upon the importance of critical thinking and reading as tools for Catholics to maintain their faith in a world that increasingly moves away from God. He challenges the notion that the Catholic religion is merely a source of comfort, instead highlighting the often difficult and demanding nature of true faith. The lecture concludes with a call for Catholics to engage more deeply with their faith, to think critically about the teachings of the Church, and to recognize the inherent conflict between the principles of modern liberalism and Catholic doctrine.