In this sermon, the key theme in chapter one of the book is God speaking. Throughout the chapter, it is emphasized that God has spoken in various ways about His Son. This includes speaking to the fathers through the prophets in the past, speaking in His Son Jesus Christ in the present, speaking for His Son in His resurrection, relationship, and return, and speaking to His Son. The purpose of the sermon is to warn those who have heard the message of salvation but are in danger of neglecting it, as neglecting it can result in losing the promised salvation. The sermon also highlights the greatness of Jesus and the New Testament message, emphasizing the importance of not neglecting it. The sermon continues into chapter two, where the warning is stated and the significance of the word "therefore" is explained, indicating that it refers to what has already been said.

In this sermon, the preacher reflects on Psalm 8 and the greatness of God's creation. He emphasizes the question posed in the psalm, "What is man?" and highlights the elevated position that God originally gave to humanity. However, due to the fall of man, humans lost their dominion over creation. The preacher then shifts to the topic of practical sanctification, explaining that God's will for Christians is to be set apart from evil and sin, as stated in John 17:17 and 1 Thessalonians 4:3. He emphasizes the importance of the Word of God in achieving this sanctification.

In this sermon, the speaker focuses on the book of Hebrews, specifically chapter 1. The key theme throughout the chapter is that God is speaking. The speaker highlights four ways in which God is speaking in this chapter: speaking about his son, speaking in his son, speaking for his son, and speaking in the past. The speaker encourages the audience to read through the book of Hebrews, write down all the verses that mention God speaking, and submit their findings in two weeks. The sermon emphasizes the greatness of Christ and how he is described in the book of Hebrews.