In the story of Cain, we see the development of sin. Jealousy leads to anger, and anger leads to murder. In this story, we see ourselves in the ‘mirror’ of God’s Word. Here, God emphasizes our exceeding sinfulness - ‘The heart is deceitful above all things, and desperately corrupt’ (Jeremiah 17:9). Our sinfulness leads us away from ‘the presence of the Lord’ to ‘the land of wandering (Nod)’ (Genesis 4:16). This is the work of Satan in our lives - Genesis 4 is an extension of Genesis 3. Even in the land of wandering, the hand of God is upon us. This is the meaning of ‘the mark of Cain’ - ‘so that no one who found him would kill him’ (Genesis 4:15). Even in our wanderings, God is waiting in mercy for us to make our way back to Him by coming in faith to Jesus Christ our Saviour. Even when ‘sin’ is a good bit more than ‘crouching at the door’, it can be ‘mastered’ through Christ (Genesis 4:6; Hebrews 7:25).