For this is the will of God, your sanctification; that you should abstain from fornication;

“Providence being a disciplinary art; in the case of others for each individual's sins, and in the case of the Lord and His apostles for ours. To this point says the divine apostle: "For this is the will of God, even your sanctification, that ye abstain from fornication: that each one of you should know how to possess his vessel in sanctification and honour; not in the lust of concupiscence, as the Gentiles who know not the Lord: that none of you should overreach or take advantage of his brother in any matter; because the Lord is the avenger in respect of all such, as we also told you before, and testified. For God hath not called us unto uncleanness, but to holiness. Wherefore he that despiseth, despiseth not man, but God, who hath also given His Holy Spirit to you." For the devil tempting us, knowing what we are, but not knowing if we will hold out, but wishing to dislodge us from the faith, attempts also to bring us into subjection to himself. Which is all that is allowed to him, partly from the necessity of saving us, who have taken occasion from the commandment, from ourselves; partly for the confusion of him who has tempted and failed; for the confirmation of the members of the Church, and the conscience of those who admire the constancy [displayed]. ... For neither did the Lord suffer by the will of the Father, nor are those who are persecuted by the will of God; since either of two things is the case: either persecution in consequence of the will of God is a good thing, or those who decree and afflict are guiltless. But nothing is without the will of the Lord of the universe. It remains to say that such things happen without the prevention of God; for this alone saves both the providence and the goodness of God. We must not therefore think that He actively produces afflictions (far be it that we should think this!); but we must be persuaded that He does not prevent those that cause them, but overrules for good the crimes of His enemies: "I will therefore," He says, "destroy the wall, and it shall be for treading under foot." Providence being a disciplinary art; in the case of others for each individual's sins, and in the case of the Lord and His apostles for ours. To this point says the divine apostle: "For this is the will of God, even your sanctification, that ye abstain from fornication: that each one of you should know how to possess his vessel in sanctification and honour; not in the lust of concupiscence, as the Gentiles who know not the Lord: that none of you should overreach or take advantage of his brother in any matter; because the Lord is the avenger in respect of all such, as we also told you before, and testified. For God hath not called us unto uncleanness, but to holiness. Wherefore he that despiseth, despiseth not man, but God, who hath also given His Holy Spirit to you."”

“Christ gave this judgment when, being inquired of, He said that a wife must not be put away, save for the cause of adultery; such honour did He put upon chastity. Hence arose the decree: "Ye shall not suffer adulteresses to live." Hence the apostle says: "This is the will of God, that ye abstain from fornication." Hence also he says the same thing: "That the members of Christ must not be joined with the members of an harlot." Hence the man is delivered over unto Satan for the destruction of the flesh, who, treading under foot the law of chastity, practises the vices of the flesh. Hence with reason adulterers do not attain the kingdom of heaven. Hence it is that every sin is without the body, but that the adulterer alone sins against his own body. Hence other authoritative utterances of the instructor, all of which it is not necessary at this time to collect, especially among you, who for the most part know and do them; and you cannot find cause for complaint concerning these things, even though they are not described. For the adulterer has not an excuse, nor could he have, because he might take a wife.”

“"For this is the will of God, even your sanctification." And observe how he nowhere so vehemently glances at any other thing, as at this. As elsewhere also he writes to this effect; "Follow after peace with all men, and the sanctification without which no man shall see the Lord." (Heb. xii. 14) And why dost thou wonder, if he everywhere writes to his disciples upon this subject, when even in his Epistle to Timothy he has said, "Keep thyself pure." (1 Tim. v. 22) Also in his second Epistle to the Corinthians he has said, "In much patience, in fastings, by pureness." (2 Cor. vi. 5, 6) And one may find this in many places, both in this Epistle to the Romans, and everywhere, and in all his Epistles. For in truth this is an evil pernicious to all. And as a swine full charged with mire, wherever he enters, fills all places with his ill odor, and chokes the senses with dung, so too does fornication; it is an evil not easy to be washed away. But when some even who have wives practice this, how excessive is the outrage! "For this," he says, "is the will of God, even your sanctification, that ye abstain from all fornication." For there are many forms of disorderly conduct. The pleasures of wantonness are of many kinds and various, it were not tolerable to mention them. But having said "from all fornication," he leaves it to those who know them.”

“The disease of disordered desire is what the apostle refers to, when, speaking to married believers, he says, "This is the will of God, even your sanctification, that you should abstain from fornication, that everyone of you should know how to possess his vessel in sanctification and honor, not in the disease of desire, even as the Gentiles who do not know God." The married believer, therefore, must not only not use another man's vessel—which is what they do who lust after other men's wives—but he must know that even his own vessel is not to be possessed in the disease of disordered sexual desire. Paul's counsel is not to be understood as if the apostle prohibited conjugal—that is to say, lawful and honorable—cohabitation.”

“It is said through the voice of the prophet to the soul that grows proud, "You trusted in your beauty and played the harlot because of your renown." For a soul to trust in its beauty is to presume within itself on its righteous works. It plays the harlot on the basis of its renown when in its righteous acts it seeks the glory of its own reputation rather than the spread of its Creator's praise.… What then is to be done in this case but that, when the malignant spirit of pride enjoys the good things that we have done in order to exalt the mind, we should ever recall to memory our evil deeds. The goal is that we may acknowledge our sinful acts as our own and our avoidance of sin as the gift of Almighty God. And so Paul says, "For this is the will of God, even your sanctification, that you abstain from unchastity."”

“Above, the Apostle commended the faithful for their constancy in tribulations and other goods; here he admonishes them, for the future, to act well. And first he sets forth a general admonition; second he specifies, at "that you abstain." Concerning the first he does two things: first he sets forth his intention, second he assigns the reason for the admonition, at "that you may abound," etc. He says therefore: I have heard of your past goods, but for the future we ask, etc. He induces them, first, on his own part. And so he says "we ask." Ps. 121:6: "Ask the things that are for peace," etc. Likewise on Christ's part, and so he says "we beseech," etc. He beseeches, however, because they were perfect. 1 Tim. 5:1: "Do not rebuke an elder, but beseech him as a father." But what does he ask? "That just as," etc. The Apostle had taught them how they ought to walk in the common way of justice, which is through the commandments. Hence he says: "you have received," etc. Ps. 118:32: "the way of your commandments," etc. Likewise how they might please God in the way of counsels. Wis. 4:10: "Being pleasing to God, he was made beloved." Or how you should walk, namely through right action. Jn. 12:35: "Walk while you have the light." How you should please, namely through right intention. "So also you may walk" — that is, that you keep to the first doctrine, not withdrawing from it. Gal. 1:8: "But though we, or an angel from heaven, should preach to you besides that which we have preached to you, let him be anathema." The reason for the admonition is taken, first, from the fruit of keeping the admonition; second, from the admonition itself, at "for you know what," etc. He says therefore: although you are good, yet through the exercise of the commandments and counsels you will abound and progress. 2 Cor. 9:8: "God is able to make all grace abound in you." For charity is so great that there always remains that in which one may progress. Likewise, the things which you received from the admonition are honorable and useful. Ps. 18:8: "The law of the Lord is unspotted," etc. Prov. 6:23: "The commandment is a lamp, and the law a light, and the way of life." Therefore he says "what precepts" — that is, of what sort. And this received through the Lord Jesus, from him. 1 Cor. 11:23: "For I have received of the Lord that which also I delivered unto you," etc. Heb. 2:3: "which, since it had received its beginning to be declared through the Lord, from those who heard," etc. And these are these things. "This is the will of God, your sanctification" — as if he were to say: all the precepts of God are for this, that you may be holy. For holiness denotes cleanness and firmness. And all the precepts of God lead to these: that one be clean from evil, and firm in good. Rom. 12:2: "that you may prove what is the will of God" — namely, as explained through the precepts. Then, when he says "that you abstain," he admonishes in particular. And first he corrects them concerning certain disorders among them; second he urges them to the observance of good things, in chapter 5, at "concerning the times." Now there were three disorders among them: namely, of carnal vices as regards some, likewise of curiosity, likewise of sorrow over the dead; and therefore he treats of these. The second, at "but concerning charity." The third, at "we would not have you." Concerning the first he does two things: first he admonishes them to abstain from an immoderate appetite for carnal things; second he gives the reason, at "because the avenger." Again, the first is divided into two, because first he forbids lust; second, avarice. And he always joins these together, because each is concerned with a bodily object, although this is completed in spiritual delight. Likewise, first he teaches to beware of lust as regards one not one's own; second as regards one's own wife, at "that he may know." He says therefore "that you abstain from fornication." For it is the will of God to abstain from fornication; therefore it is a mortal sin, because it is against the precept and will of God. Tob. 4:13: "Keep yourself from all fornication." But also with respect to one's wife you should abstain honorably, so that each one may know how to possess his vessel — that is, his wife — "in sanctification," ceasing for a time, "and in honor, not in passion" — namely, so that passion should go before — "even as the Gentiles" — because this is the way of the Gentiles, to seek present delights, but not those of the future life. "In sanctification and honor," because here is the due use of marriage, which is for the good of offspring, or for rendering the debt, and thus it can be without sin; but sometimes it is a venial sin, if concupiscence is not carried beyond the bounds of marriage — namely when, although he has concupiscence, he would nevertheless not use it unless she were his wife. But when it is outside the bounds of marriage, mortal sin follows, and this is when, if she were not his wife, he would still use her, and more willingly with another. Heb. last [chapter], 4: "Let marriage be honorable, and the bed undefiled." "But fornicators and adulterers God will judge." 1 Pet. 3:7: "Husbands likewise dwelling with them according to knowledge, giving honor to the woman as to the weaker vessel, as to co-heirs of grace and life, that your prayers be not hindered." Then, when he says "and let no man," he forbids avarice. Hence he says "and let no man overreach" — that is, use violence by taking away another's goods through power. Jas. 2:6: "Do not the rich oppress you by might?" Nor circumvent by deceit. Jer. 5:27: "As a snare full of birds, so their houses are full of deceit." Then, when he says "because the avenger," etc., the reason for the admonition is given, which he first assigns from divine vengeance; second he shows this vengeance to be just, at "for he has not called." He says therefore: let us abstain from these things, because "the Lord is the avenger." Gal. 5:21: "I foretell you, as I have foretold you, that they who do such things shall not obtain the kingdom of God." For certainly he avenges justly, of which there is one reason from God calling, a second from the contrariety to the gift. If the Lord calls you to one thing, and you do the contrary, you are worthy of punishment. And therefore he says "for he has not called," etc. Eph. 1:4: "He chose us in him before the foundation of the world, that we should be holy and unspotted in his sight in charity." Rom. 8:30: "whom he called, them he also justified," etc. Therefore he says "therefore," etc.; as if to say: this is one special reason which I have stated. There is another reason, because these vices are contrary to the Spirit, who has been given to us. Hence, whoever does these things does injury to the Holy Spirit. Therefore he says "who also," etc. Heb. 10:28: "A man making void the law of Moses dies without any mercy, on the word of two or three witnesses; how much more, do you think, does he deserve worse punishments, who has trodden underfoot the Son of God, and has held the blood of the testament unclean in which he was sanctified, and has done despite to the Spirit of grace?" Then, when he says "but concerning charity," etc., he draws them back from idleness. Now it must be known that, as Jerome says in his letter to the Galatians, the Thessalonians were generous, and it was their custom for the rich to give much; and therefore the poor idly clung to their benefaction, not caring for labors, but running about through houses. And therefore first he commends the generosity of the givers; second he dissuades the idleness of the receivers, at "and that you give attention." He says therefore, first, that they do not need to be admonished to charity; second he admonishes that they progress in it, at "but we ask." He says therefore "but concerning the charity of brotherhood" — that is, that you love the brethren — "it is not necessary to write to you." Rom. 12:10: "Loving one another with the charity of brotherhood." Heb. last [chapter]: "Let the charity of brotherhood remain in you." And the reason is because "you yourselves have learned from God" — namely, the precept in the law. Lev. 19:18: "You shall love your friend as yourself." Likewise in the Gospel. Jn. 13:34: "A new commandment I give you, that you love one another," etc. Or, you have learned by interior instruction. Jn. 6:45: "Everyone who has heard from the Father, and has learned, comes to me," etc. And this he learns through the Holy Spirit. Then, when he says "but we ask," he exhorts them to progress in charity, saying: and because you have charity toward all, therefore we ask that you progress. And although others abuse it, you nevertheless should persist. Prov. 15:5: "In abundant justice virtue is greatest." Then, when he says "and that you give attention," he reproves the idle: first their restlessness; second he shows how they should repress it; third, why. He says therefore: "that you give attention, that you be quiet." Prov. 7:10: "talkative and wandering, impatient of quiet, nor able to remain in the house with her feet," etc. 2 Thess. 3:7: "We were not restless among you, neither did we eat any man's bread for nothing, but in labor and weariness, working night and day," etc. Repressing idleness by exercising business. Hence he says "and that you do your own business." Prov. 24:27: "Diligently work your field, that afterward you may build your house." He says, however, "your own" — but is it not the case that another's business is also to be done? And it seems that it is so. Rom. last [chapter]: "that you assist her in whatever business." I respond. It must be said that all things can be done in a disordered way, if they are done outside the order of reason — namely when someone conducts himself dishonestly — and in an ordered way, namely when the order of reason is kept, and in necessity, and this is commendable. "And that you work with your own hands" — that is, by working with your hands. Ecclus. 33:29: "Idleness has taught much evil," etc. Ezek. 16:49: "This was the iniquity of Sodom your sister: pride, fullness of bread, and abundance, and the idleness of her and of her daughters, and they did not reach out a hand to the needy and the poor," etc. And this is a precept for all those who do not have other means by which they can live lawfully; because it is a precept of nature that a man should sustain his body. 2 Thess. 3:10: "He who is not willing to work, let him not eat either." Of this there is a twofold reason. The first, on account of the example to others. Hence he says "that also honestly," etc. For unbelievers, seeing your manner of life so idle, detest you. 1 Tim. 3:7: "But he must have a good testimony from those who are outside," etc. The second reason, that you should not desire the things that are others'; hence it is said "and that you desire nothing of any man's." Prov. 21:25: "Desires kill the slothful." Eph. 4:28: "He who stole, let him now steal no more," etc. And therefore, if this restlessness is repressed, it results in good example, and in the repression of desire.”

“For this is the will of God, even your sanctification,.... Which is another reason to enforce the above exhortation. "Sanctification" is internal or external. Internal sanctification is the work of the Spirit of God, and is a principle of spiritual life in the soul, a divine and spiritual light in the understanding, a flexion of the will to the will of God, and a settlement of the affections on divine things, and is an implantation of every grace in the heart. External sanctification arises from this, and lies in holiness of life and conversation; and is what is chiefly designed, as appears both by what goes before, and follows after: and this is "the will of God"; the will of his purpose and decree; for in the same decree that he wills the salvation of any by Jesus Christ, he also wills their sanctification in heart and life, and here and hereafter: and this is his approving will, or what is well pleasing in his sight, being agreeable to his nature, and divine perfections, particularly his holiness, in which he is glorious; and it is his will of command, and what he requires in his law, which is holy, just, and good, and perfectly agrees with the sound doctrine of the Gospel, and the revelation of his will in both. That ye should abstain from fornication: which is particularly mentioned, abstinence from it being a branch of external holiness; and because that this sin was common among the Gentiles, and not esteemed a sin by them; as also to observe to these Christians, that as simple fornication was not to be allowed of, much less other acts of uncleanness, as adultery, incest, sodomy, and the like, which were iniquities that greatly prevailed among the Heathens. The Syriac version renders it, "from all fornication"; on this subject the apostle enlarges in some following verses.”

“This is the will of God, even your sanctification - God has called you to holiness; he requires that you should be holy; for without holiness none can see the Lord. This is the general calling, but in it many particulars are included. Some of these he proceeds to mention; and it is very likely that these had been points on which he gave them particular instructions while among them. That ye should abstain from fornication - The word πορνεια, as we have seen in other places, includes all sorts of uncleanness; and it was probably this consideration that induced several MSS., some versions and fathers, to add here πασης, all. Directions of this kind were peculiarly necessary among the Greeks, and indeed heathens in general, who were strongly addicted to such vices.”