What does the way of Cain teach us?

The way of Cain serves as a stark warning to us about the dangers of relying on our own works or righteousness to gain God's favor. Cain believed that his personal efforts were sufficient for acceptance by God, but the Lord rejected his offering because it lacked the sacrifice that was truly required. This teaches us that salvation cannot be earned; it is a gift of grace from God. In understanding Cain's error, we recognize that true acceptance before God comes only through divine grace and the perfect sacrifice of Jesus Christ, who was without sin.