Now Abel kept flocks, and Cain worked the soil. In the course of time Cain brought some of the fruits of the soil as an offering to the Lord. But Abel brought fat portions from some of the  firstborn of his flock. The Lord looked with favor on Abel and his offering, but on Cain and his offering he did not look with favor.  So Cain was very angry, and his face was downcast. Genesis 4:2b-5 Do you see the difference between Cain and Abel? Abel easily gave exactly what God wanted because he did not worship possessions but rather God, but Cain gave up what he (Cain) wanted to give up and kept back what he thought would be good for his pocketbook...