Genesis is the book of origins, the book of beginnings. And in this section from Genesis 2:4 to the end of Genesis 4 Moses has been laying the foundation for understanding all of human history, society, relationships and religion. In Genesis 3 we saw sin introduced into the perfect human family that God had created in His image and the devastating consequences of that sin. And now in Genesis 4 we are seeing the destructive nature of expanding sin in the next generation from Adam and Eve as Cain murders his brother Abel after being warned by God against sin. We saw how Cain was concerned about his punishment but not at all repentant over his sin. The rest of Genesis 4 summarizes the way of Cain as seen in his descendants.