Genesis 4:5-7

Cain was very wroth Full of rage against God and his brother. His countenance fell His looks became sour, dejected, and angry. The Lord said unto Cain to convince him of his sin, and bring him to repentance, Why art thou wroth? What cause has been given thee, either by me or thy brother? If thou doest well, shalt thou not be accepted? Either, 1st, If thou hadst done well, as thy brother did, thou shouldest have been accepted as he was. God is no respecter of persons; so that, if we come short of acceptance with him, the fault is wholly our own. This will justify God in the destruction of sinners, and will aggravate their ruin. There is not a damned sinner in hell, but, if he had done well, as he might have done, had been a glorified saint in heaven. Every mouth will shortly be stopped with this. Or, 2d, If now thou do well If thou repent of thy sin, reform thy heart and life, and bring thy sacrifice in a better manner; thou shalt yet be accepted. See how early the gospel was preached, and the benefit of it offered even to one of the chief of sinners! He sets before him also death and a curse; but, if not well Seeing thou didst not do well: not offer in faith, and in a right manner; sin lieth at the door That is, sin only hinders thy acceptance. All this considered, Cain had no reason to be angry with his brother, but at himself only. Unto thee shall be his desire He shall continue to respect thee as an elder brother, and thou, as the firstborn, shalt rule over him as much as ever. God's acceptance of Abel's offering did not transfer the birthright to him, (which Cain was jealous of,) nor put upon him that dignity and power which are said to belong to it, Genesis 49:3.