This is a lesson about the nature of man and society. It argues that humans are social beings by nature, and that the common good is best served by a society built on the principles of subsidiarity and solidarity. The lesson also discusses the need for authority, emphasizing that all authority derives from God and that legitimate authority must serve the common good. It emphasizes that the common good requires individual conversion and the practice of charity, and explains the role of the laity in shaping the political and social landscape.