Matthew 5:27

The Lord having explained how much is contained in the first commandment, namely, "Thou shalt not kill," proceeds in regular order to the second.

"Thou shalt not commit adultery," that is, Thou shalt go no where but to thy lawful wife. For if you exact this of your wife, you ought to do the same, for the husband ought to go before the wife in virtue. It is a shame for the husband to say that this is impossible. Why not the husband as well as the wife? And let not him that is unmarried suppose that he does not break this commandment by fornication; you know the price wherewith you have been bought, you know what you eat and what your drink [ed. note, g: Nic. inserts here, from the original, "immo quem manduces, quem bibas."] therefore keep yourself from fornications. Forasmuch as all such acts of lust pollute and destroy God's image, (which you are,) the Lord who knows what is good for you, gives you this precept that you may not pull down His temple which you have begun to be.

He then goes on to correct the error of the Pharisees, declaring, "Whoso looketh upon a woman to lust after her, hath committed adultery already with her in his heart." For the commandment of the Law, "Thou shalt not lust after thy neighbour's wife," [Ex 20:17] the Jews understood of taking her away, not of committing adultery with her.

Between παθος and προπαθεια, that is between actual passion and the first spontaneous movement of the mind, there is this difference: passion is at once a sin; the spontaneous movement of the mind, though it partakes of the evil of sin, is yet not held for an offence committed. [ed. note, h: In this passage S. Jerome, who seems to have introduced the word propassio, προπαθεια, into theology, uses it somewhat in a sense of his own; viz. as involving something of the nature of sin; vid. also Comm. in Ezek. xviii, 1, 2. The word is more commonly applied to our Lord, as denoting the mode and extent in which His soul was affected by what in others became παθος. In us passion precedes reason, in Him it followed, or was a προπαθεια. vid. S. Jerome in Matt. xxvi. 37. Leo n. Ep. 35. Damasc. F. O. iii. 20 &c. &c.] When then one looks upon a woman, and his mind is therewith smitten, there is propassion; if he yields to this he passes from propassion to passion, and then it is no longer the will but the opportunity to sin that is wanting. "Whosoever," then, "looketh on a woman to lust after her," that is, so looks on her as to lust, and cast about to obtain, he is rightly said to commit adultery with her in his heart.

For there are three things which make up a sin; suggestion either through the memory, or the present sense; if the thought of the pleasure of indulgence follows, that is an unlawful thought, and to be restrained; if you consent then, the sin is complete. For prior to the first consent, the pleasure is either none or very slight, the consenting to which makes the sin. But if consent proceeds on into overt act, then desire seems to be satiated and quenched. And when suggestion is again repeated, the contemplated pleasure is greater, which previous to habit formed was but small, but now more difficult to overcome.

But whoso casts his eyes about without caution will often be taken with the pleasure of sin, and ensnared by desires begins to wish for what he would not. Great is the strength of the flesh to draw us downwards, and the charm of beauty once admitted to the heart through the eye, is hardly banished by endeavour. We must therefore take heed at the first, we ought not to look upon what it is unlawful to desire. For that the heart may be kept pure in thought, the eyes, as being on the watch to hurry us to sin, should be averted from wanton looks.

If you permit yourself to gaze often on fair countenances you will assuredly be taken, even though you may be able to command your mind twice or thrice. For you are not exalted above nature and the strength of humanity. She too who dresses and adorns herself for the purpose of attracting men's eyes to her, though her endeavor should fail, yet shall she be punished hereafter; seeing she mixed the poison and offered the cup, though none was found who would drink thereof. For what the Lord seems to speak only to the man, is of equal application to the woman; inasmuch as when He speaks to the head, the warning is meant for the whole body.

And with regard to our not swearing at all, and always speaking the truth, He enjoined as follows: “Swear not at all; but let your yea be yea, and your nay, nay; for whatsoever is more than these cometh of evil.” And that we ought to worship God alone, He thus persuaded us: “The greatest commandment is, Thou shalt worship the Lord thy God, and Him only shall thou serve, with all thy heart, and with all thy strength, the Lord God that made thee.” And when a certain man came to Him and said, “Good Master,” He answered and said, “There is none good but God only, who made all things.” And let those who are not found living as He taught, be understood to be no Christians, even though they profess with the lip the precepts of Christ; for not those who make profession, but those who do the works, shall be saved, according to His word: “Not every one who saith to Me, Lord, Lord, shall enter into …

1. And that the Lord did not abrogate the natural [precepts] of the law, by which man is justified, which also those who were justified by faith, and who pleased God, did observe previous to the giving of the law, but that He extended and fulfilled them, is shown from His words. “For,” He remarks, “it has been said to them of old time, Do not commit adultery. But I say unto you, That every one who hath looked upon a woman to lust after her, hath committed adultery with her already in his heart.” And again: “It has been said, Thou shalt not kill. But I say unto you, Every one who is angry with his brother without a cause, shall be in danger of the judgment.” And, “It hath been said, Thou shalt not forswear thyself. But I say unto you, Swear not at all; but let your conversation be, Yea, yea, and Nay, nay.” And other statements of a like nature. …

His sic ostensis, age Scripturas, quæ adversantur sophistis hæreticis, jam adducamus, et regulam continentiæ secundum logon seu rationem observandam declaremus. Qui vero intelligit, quæ Scriptura cuique hæresi contraria sit, cam tempestive adhibendo refutabit eos, qui dogmata mandatis contraria fingunt. Atque ut ab alto rem repetamus, lex quidem, sicut prius diximus, illud, “Non concupisces uxorem proximi tui,” prius exclamavit ante conjunctam Domini in Novo Testamento vocem, quæ dicit ex sua ipsius persona: “Audivistis legem præcipientem: Non mœchaberis. Ego autem dico: Non concupisces.” Quod enim vellet lex viros uti moderate uxoribus, et propter solam liberorum susceptionem, ex eo clarum est, quod prohibet quidem eum, qui non habet uxorem, statim cum” captiva” habere consuetudinem. Quod si semel desideraverit, ei, cum tonsa fuerit capillos, permittere ut lugeat triginta diebus. …

Plainly, if you show by what patronages of heavenly precedents and precepts it is that you open to adultery alone, and therein to fornication also, the gate of repentance, at this very line our hostile encounter will forthwith cross swords. Yet I must necessarily prescribe you a law, not to stretch out your hand after the old things, not to look backwards: for “the old things are passed away,” according to Isaiah; and “a renewing hath been renewed,” according to Jeremiah; and “forgetful of former things, we are reaching forward,” according to the apostle; and “the law and the prophets (were) until John,” according to the Lord. …

3. As "the law and the prophets" may have three different meanings, it is uncertain in what sense the words are used by Jesus, though we may form a conjecture from what follows. For if Jesus had gone on to speak of circumcision, and Sabbaths, and sacrifices, and the observances of the Hebrews, and had added something as a fulfillment, there could have been no doubt that it was the law and the prophets of the Jews of which He said that He came not to destroy, but to fulfill them. But Christ, without any allusion to these, speaks only of commandments which date from the earliest times: "Thou shall not kill; Thou shalt not commit adultery; Thou shalt not bear false witness." These, it can be proved, were of old promulgated in the world by Enoch and Seth, and the other righteous men, to whom the precepts were delivered by angels of lofty rank, in order to tame the savage nature of men. …

21. Will it be said that the law in these early times was incomplete as regards not committing adultery, till it was completed by the Lord, who added that no one should look on a woman to lust after her? This is what you imply in the way you quote the words, "Ye have heard that it has been said, Thou shalt not commit adultery: but I say unto you, Do not lust even." "Here," you say, "is the fulfillment." But let us take the words as they stand in the Gospel, without any of your modifications, and see what character you give to those righteous men of antiquity. …

See how he again in this place spares the flesh and the Law. For he does not say that the Law was made of no effect, or that the flesh was made of no effect, but that we were made of no effect (i.e., were delivered). And how were we delivered? Why by the old man, who was held down by sin, being dead and buried. For this is what he sets forth in the words, “being dead to that, wherein we were held.” As if he had said, the chain by which we were held down was deadened and broken through, so that that which held down, namely sin, held down no more. But do not fall back or grow listless. For you have been freed with a view to being servants again, though not in the same way, but “in newness of spirit, and not in the oldness of the letter.” Now what does he mean here? for it is necessary to disclose it here, that when we come upon the passage, we may not be perplexed with it. …