What does it mean to look on a woman to lust (Matthew 5:28)?

Adultery in the heart

The Lord Jesus now explains that before God it is not just the accomplished act that is sin, but the looking with lust on a woman, for this is adultery in the heart. The word "adultery" shows that either the man or both are married. Nevertheless, no unmarried believer should think that these words of the Lord have nothing to say to him.

The Lord is not speaking here about accidental, unintentional looks which can hardly be avoided, but about the conscious covetous looking: "Whosoever looketh on a woman to lust after her..." The intentional look is therefore preceded by the sinful thought in the heart.

This distinction is very important. Nowadays we can hardly move in this world without, unintentionally, continually witnessing the moral depravity of our time. We are easily defiled by this. The intentional covetous and sinful look is something completely different. No Christian can avoid unclean thoughts rising up in his mind but they only become sin when instead of turning away from them he consciously gives himself to them. If covetous looks and unclean lines of thought are sin, then it is also sin if believing women and girls cause and provoke this by their dress and behaviour.

Adultery in the heart

The Lord Jesus now explains that before God it is not just the accomplished act that is sin, but the looking with lust on a woman, for this is adultery in the heart. The word “adultery” shows that either the man or both are married. Nevertheless, no unmarried believer should think that these words of the Lord have nothing to say to him.

The Lord is not speaking here about accidental, unintentional looks which can hardly be avoided, but about the conscious covetous looking: “Whosoever looketh on a woman to lust after her … ” The intentional look is therefore preceded by the sinful thought in the heart.

This distinction is very important. Nowadays we can hardly move in this world without, unintentionally, continually witnessing the moral depravity of our time. We are easily defiled by this. The intentional covetous and sinful look is something completely different. No Christian can avoid unclean thoughts rising up in his mind but they only become sin when instead of turning away from them he consciously gives himself to them. If covetous looks and unclean lines of thought are sin, then it is also sin if believing women and girls cause and provoke this by their dress and behaviour.

The more casual and free contact between the sexes, especially with the younger generation and the negative example of most of their peers of the world, can lead to carelessness and great dangers. God-fearing Job said: “I made a covenant with mine eyes; why then should I think upon a maid?” (Job 31:1). However, there are also over-sensitive and over-anxious Christians whose consciences are heavily burdened by involuntary looks and thoughts. I would like to remind such of the well-known words of Martin Luther which he wrote on this verse: “I cannot prevent a bird flying over my head, but what I can prevent is it building a nest in my hair or biting off my nose.”

Let one instance suffice out of the seven occasions in that discourse when our Lord said, “I say to you.” “Ye have heard that it was said of them of old time, Thou shalt not commit adultery: but I say to you, That whosoever looks on a woman to lust after her has committed adultery with her already in his heart” (Matt. 5:27-28). Where is there the setting aside of the law? Nay, He upheld it. The law was content to forbid the actual act, the Lord went further, and not only forbad the outward act, but the inward desire.

For that reason the Lord now says, "But I say unto you, That whosoever looketh on a woman to lust after her, hath committed adultery with her already in his heart" (v. 28). Because of the teaching of the scribes and Pharisees, the Jews thought the mere outward observance of the law was the way to be justified before God. Here, the Lord points to the human heart and shows that adultery has its source there. This is not a "spiritualisation of the law," as is sometimes said. He reveals for the first time something which had to become clear by experience to every honest Israelite, namely, that everyone who endeavoured to keep the commandment, "Thou shalt not commit adultery," had within themselves those very lusts which led to the actions forbidden by God, and had not the strength to overcome them. The lusts were even provoked by the commandment: "... for I had not known lust, except the law had said, Thou shalt not covet" (Rom. 7: 7-11).

For that reason the Lord now says, “But I say unto you, That whosoever looketh on a woman to lust after her, hath committed adultery with her already in his heart” (v. 28). Because of the teaching of the scribes and Pharisees, the Jews thought the mere outward observance of the law was the way to be justified before God. Here, the Lord points to the human heart and shows that adultery has its source there. This is not a “spiritualisation of the law,” as is sometimes said. He reveals for the first time something which had to become clear by experience to every honest Israelite, namely, that everyone who endeavoured to keep the commandment, “Thou shalt not commit adultery,” had within themselves those very lusts which led to the actions forbidden by God, and had not the strength to overcome them. The lusts were even provoked by the commandment: “ … for I had not known lust, except the law had said, Thou shalt not covet” (Rom. 7:7-11).

As violence then was judged and excluded in any shape for the disciples, so was impurity. The avoidance of the extreme act might satisfy a Pharisee or Scribe; but the Lord could not dispense with anything short of truth in the inward parts. To look at a woman lustfully was to commit adultery with her already in his heart; and it is not the outside only that God regards but the heart above all. It is only a new nature that delights in holiness; and he who has it by grace answers to the will of God his Father; and abhors himself if he slip even into a wrong look, as unworthy of his calling and hateful to Him who loves him.

The next two expansions of the law are concerning purity and divorce. Not alone the deed itself, which was punishable by a severe penalty, is sin, but every one who looks upon a woman to lust after her has already committed adultery with her in his heart. Out of the heart the transgression comes, and the heart is evil. And this is what so many persons in Christendom say is their creed and standard for "religion"! It is the word which condemns them altogether.

The plucking out of the right eye and the sacrificing of the right hand is, of course, never to be understood in the literal sense, but stands for the inner exercise of the believer, who in self-judgment puts that away which is a snare or a stumbling block. But what sinner can do it or will do it? Let him try it. And while there is in our day an increased boasting in a better morality, a higher standard, and a "social Christianity" is attempted and built upon certain words of our Lord in this discourse, it becomes more and more evident that the lust of the eye and the lust of the flesh are honeycombing all classes of the professing church and are practiced as never before. So it is with divorce. What dreadful things might be mentioned here! Among the Jews the greatest laxity prevailed in this direction. Even now through talmudical laws the marriage relations may be dissolved on a mere pretext. Our Lord says with the voice of authority, binding ever: "Whosoever shall put away his wife except for cause of fornication makes her commit adultery, and whosoever marries one that is put away commits adultery."

Some of us were speaking about the Sermon on the Mount as found in Matthew 5-7. We noticed how the Lord puts His hand on the desires of the heart. It is not sufficient to have strength not to commit the sins of the flesh, but the desire of the heart, as the flesh works, must not be encouraged. Though shame would forbid the outward acts of the flesh, yet if carnal desires are cherished in any way, then the Lord looks upon that as gravely as if the act were committed.

It is not the first step that leads to a public fall. There must be the secret encouragement before things get to the point of open scandal. In the Sermon on the Mount it is “the PURE in heart” that will see God. It is well to be exercised about the thoughts of the heart, for if they are kept in captivity to the Lord actions will be right. Spurgeon said, “You cannot forbid unclean birds flying over your head, but you can hinder their making a nest in your hair.”

Thoughts unbidden come into the mind that clearly are not of the Spirit of God, but of the flesh. We need not trouble about them, unless we are so foolish as to willingly give them a lodging place in our hearts. The wise man knew full well where the citadel of life is situated, when he wrote to his son, “Keep thy HEART with all diligence; for out of it are the issues of life” (Prov. 4:23).

Hopeless then was their confidence in the law. But the Lord had not done with it for the purpose of conviction; and of clearing it from the mistakes and perversions of the scribes. He goes over, therefore, from the sixth to the seventh commandment, to show once more that out of the heart the positive transgression comes, and that what was in the heart to do was in fact done as to the guilt of it. Opportunity might be lacking, which altered nothing: the sin was in the heart.

And He urges that if the right eye or hand cause men to stumble, it were better to cut them off and go on maimed through life, than to preserve these and go with a whole body into hell. Better sacrifice what might seem most necessary than give oneself up to the sure penalty of sin. Clearly no asceticism or self mutilation is intended by such an injunction; but men excuse on the plea of necessity what they find to be a constant provocative of sin. God's law admits no pretext of the kind.

As to the two commandments He quoted, His teaching evidently is that God has respect not only to the overt act but also to the inward disposition of the heart. What is prohibited is not merely the act of murder or adultery but the hatred and the lust of which the act is the expression. Judged by this standard, who is going to stand before the holy demands of Sinai? The "righteousness" of the scribe and Pharisee utterly collapses. Yet in both cases, having exposed this fact, He added some further instruction.