What does the Bible say about the contrast between Cain and Seth?

In Genesis 4, Cain represents those who seek refuge in their own works and pride, as seen when he builds a city to name it after his son, which symbolizes his reliance on human achievement. In contrast, Seth's lineage begins to call upon the name of the Lord, indicating that true security and identity are found in God's promise and grace, rather than in human efforts. This illustrates the two cities: one dependent on human pride and works (the city of Cain), and the other founded on faith in God (the city of Seth). Believers are encouraged to seek the city built by God, whose foundation is Christ, emphasizing grace rather than human merit.