Cain, the “worker of the ground,” is angry. His offering to God has brought him “no regard.” (Genesis 4:2,4) His face falls. God asks, “Why are you angry, and why has your face fallen? If you do well, will you not be accepted?” Then God warns, “And if you do not do well, sin is crouching at the door. Its desire is for you, but you must rule over it.” (Genesis 4:7)
Sin desires to rule over Cain, and succeeds. Cain’s anger against God turns to envy of and jealousy against his brother. He rises up against Abel and kills him “when they are in the field.” (Genesis 4:8)
Anger against God results in failing to be our “brother’s keeper.” (Genesis 4:9) Since we are unable to strike out at God in any direct manner, we turn against our brothers. In our anger is the seed of murder.
Sin has a consequence for Cain, one which “is greater than [he] can bear.” (Genesis 4:13) He “goes away from the presence of the Lord.” (Genesis 4:16) “Sin is crouching at the door. Its desire is for you, but you must rule over it.” (Genesis 4:7) The consequence – separation from God – “is greater than [we] can bear.” (Genesis 4:13)
Jesus says, “Enter by the narrow gate. For the gate is wide, and the way is easy that leads to destruction, and those who enter by it are many. For the gate is narrow and the way is hard that leads to life, and those who find it are few.” (Matthew 7:13-14)