Somewhere along the way, most of us learned to read the seventh commandment like a fence around a property line. Adultery is something married people do with their bodies, and as long as you have not done that, you have kept the commandment. Case closed. There is a version of moral life that fits neatly inside that reading, and plenty of respectable people have lived inside it their whole lives.
Jesus will not let the fence stand.
In Matthew 5:27-30, standing in the middle of the Sermon on the Mount, he takes the commandment everyone thought they had managed and moves the property line. You have heard it said, he begins, and then he says what he always says: but I tell you. Anyone who looks with lustful intent has already committed adultery, and the location he names is not the bed. It is the heart.
Pastor George Bowen preached this text on a Sunday in August, and he refused to soften it. The culture around us has been discipled by the sexual revolution, he said, and its common refrain is that sex is no big deal. Scripture answers that sex is soul-uniting. It is never just sex, Paul writes, because the two become one flesh. Something real happens, something that can even defraud a future spouse, and deep down most of us know it. That is why it hurts the way it hurts.
But the sermon refused the opposite error too. Jesus is not squeamish about sex. There is not a hint in his words that intimacy within the covenant of marriage is anything less than a good and precious gift from God. He defends it, protects it, and treats it as worth guarding precisely because it is good. A commandment that strong is not against a gift. It is for one.
Then comes the part everyone remembers. If your right eye causes you to sin, tear it out. If your right hand causes you to sin, cut it off. Jesus reaches for the most violent image available to him, and the grammar itself carries urgency. Whatever else this is, it is not a suggestion to try harder next quarter.
A man once amputated his own leg to stay alive. A tree pinned him far from help, and when he understood no one was coming, he tied a shoelace above the break, tightened it with a wrench, and used a pocket knife. He lost a leg and kept his life, and nobody calls that extreme. Jesus is saying: treat sexual sin with that math. Some losses are better than others.
So we cut things off. The app goes, the subscription lapses, the route changes. Pastor George called it cultural amputation, and he was quick to say it is not legalism. There are places you cannot go and things you cannot watch if you intend to live free, and deciding that in advance is not weakness. It is wisdom standing at the door before the knocking starts.
And yet. Here is the twist in the text that most sermons skip, and this one did not. A man could actually do what Jesus describes. Gouge out the eyes, chop off the hands, blind and maimed, and still be exactly as lustful as before. Jesus knew it. Later in Matthew he says it plainly: out of the heart come evil thoughts, murder, adultery, sexual immorality. The eye is a courier. The heart signed for the package.
That means the problem was never your eyes. It was never only your phone, your feed, your circumstances, your ex, your job. Those are gates, and gates matter. But the battle is for the command center, and that is why Proverbs gives us the sermon’s title: above all else, guard your heart, for everything you do flows from it.
Guard it how? The sermon walked through it almost like a field manual. Know what the heart is worth, because you defend what you value. Renew the mind, because a heart fed by the world all week will think like the world by Friday. Watch the entry gates and make no provision for the flesh. And do not, whatever you do, try it alone. You cannot watch yourself by yourself. Solitude is not a security system.
For the married, the sermon added a word that stung and healed at once: your spouse is your chief ministry. Not someday, not after the kids, not after the platform grows. The person across the table is the ministry. Tend to that relationship, Scripture says, and it becomes a protection neither of you could be alone.
And if you have already failed, if the gate was left open and you know exactly when, the sermon ended at the only fountain that matters. If we confess our sins, he is faithful and just to forgive us our sins and to cleanse us from all unrighteousness. Not merely to pardon. To cleanse. A guilty conscience can actually be washed, because the price was paid in blood and the account is not waiting on your performance.
So guard the heart. Amputate what has to go. Renew the mind, invite someone in, and bring the whole mess to the one who gives new hearts in the first place. The eyes were never the problem. Thank God, the heart is exactly where he starts.