27 “You have heard that it was said to those of old, ‘You shall not commit adultery.’ But I say to you that whoever looks at a woman to lust for her has already committed adultery with her in his heart (Matthew 5:27–28, NKJV).”
Jesus challenges us to get to the heart of the matter when identifying and turning away from sin. Of course, adultery remains a sin as it was under the Law of Moses (Exod. 20:14; Rom. 13:9). Even the first covenant called on Israel to love the Lord God with all their heart (Deut. 6:5). Jesus drills down to the root of this (and every) sin; the heart’s desires and impulses (1 John 2:15-17). Lustful looks at a woman are adultery in the heart, and so is the act. The heart is the source of sin. Sin lurks in the recesses of the heart’s desires, emotions, and motives (Gen. 4:7; Matt. 15:19-20). God’s word has the power to pierce the heart and reach its thoughts and intents (Heb. 4:12). By doing so, it convicts us of our sins and calls us to repent (change our heart, Acts 2:37-38; 26:20). Jesus vividly described the severity of repentance: “If your right eye causes you to sin, pluck it out and cast it from you; for it is more profitable for you that one of your members perish, than for your whole body to be cast into hell. And if your right hand causes you to sin, cut it off and cast it from you; for it is more profitable for you that one of your members perish, than for your whole body to be cast into hell (Matt. 5:29–30).” Jesus will forgive our sins when we repent (Acts 17:30; Matt. 11:28-30). And drastic steps are necessary to repent to avoid sin’s eternal punishment.