The Catechism in Questions & Answers

626. What is the main content and objective of the sermon?

The main content of the sermon is the gospel of Jesus Christ, the glad tidings that Jesus has brought the sacrifice, has resurrected, and will return.
The Holy Spirit speaks through the ministers. It is in this manner that faith is inspired and reinforced. The proclamation of the word always has the objective of preparing the congregation for the return of Jesus Christ (cf. 2 Corinthians 11: 2).