This is a lesson about the Holy Spirit's role in creation, the Church, and the lives of individual believers. The lesson explores the Holy Spirit's mission in creation, His influence during the coming of the Messiah, and His active presence in the Church as the source of sanctification and growth. It also defines the Church's fundamental characteristics as "one, holy, catholic, and apostolic," explaining the meaning behind each attribute and the implications for believers' relationship with the Church. Finally, the lesson emphasizes the importance of sacraments and prayer in experiencing the Holy Spirit's fullness.