By faith Abel offered unto God a more excellent sacrifice than Cain, by which he obtained witness that he was righteous, God testifying of his gifts: and by it he being dead yet speaketh. (Hebrews 11:4)
Woe unto them! for they have gone in the way of Cain, and ran greedily after the error of Balaam for reward, and perished in the gainsaying of Core.( Jude 1:11)
Anger actually has a cycle.
1. Fear 2. Pain 3. Anger 4. Grief 5. Hatred 6. Revenge 7. Atrocity
Cain's anger begain with his fear of losing his crop. He loved his crop more than the Lord.
If thou doest well, thou shalt be accepted. And if thou doest not well, sin lieth at the door, and Satan desireth to have thee; and except thou shalt hearken unto my commandments, I will deliver thee up, and it shall be unto thee according to his desire. And thou shalt rule over him; Moses 5:33
I will ever hold dear to my heart the precious memory of my young neighbors bringing the joy of their gift to me. A gift that was given in faith and in joy.