Genesis 4:5 But unto Cain and to his offering he had not respect. And Cain was very wroth, and his countenance fell.
[Patriarchs & Prophets pp 74>77] All this caused Cain's anger to burn the hotter. Reason and conscience told him that Abel was in the right; but he was enraged that one who had been wont to heed his counsel should now presume to disagree with him, and that he could gain no sympathy in his rebellion. In the fury of his passion he slew his brother. Cain hated and killed his brother, not for any wrong that Abel had done, but “because his own works were evil, and his brother's righteous.” 1 John 3:12. So in all ages the wicked have hated those who were better than themselves.
Abel's life of obedience and unswerving faith was to Cain a perpetual reproof. “Everyone that doeth evil hateth the light, neither cometh to the light, lest his deeds should be reproved.” John 3:20. The brighter the heavenly light that is reflected from the character of God's faithful servants, the more clearly the sins of the ungodly are revealed, and the more determined will be their efforts to destroy those who disturb their peace.
The murder of Abel was the first example of the enmity that God had declared would exist between the serpent and the seed of the woman—between Satan and his subjects and Christ and His followers. Through man's sin, Satan had gained control of the human race, but Christ would enable them to cast off his yoke. Whenever, through faith in the Lamb of God, a soul renounces the service of sin, Satan's wrath is kindled. The holy life of Abel testified against Satan's claim that it is impossible for man to keep God's law.
2nd Timothy 3:12 Yea, and all that will live godly in Christ Jesus shall suffer persecution. 13 But evil men and seducers shall wax worse and worse, deceiving, and being deceived.
May The Lord add His blessing to the study of His word. God bless!