John Chrysostom
From the fornicator the Apostle passed to the covetous man. Now he returns again to the fornicator, addressing his speech not to him, but to others not guilty of adultery.
By warning them against the same sin, he also reproves him. For even when speech is addressed to another, the sinner is touched and tormented by the conscience awakened within him.
Fear of punishment could certainly restrain them sufficiently from violating chastity. But the Apostle wishes to achieve this not by fear alone. Therefore, with threats he also uses admonitions.
Earlier, when speaking about this sin, he defined its punishment, showed the harm that comes to all from fellowship with the incestuous man, and, having ended there, passed to the covetous man.
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He threatened him, as well as all the other sinners listed, with deprivation of the Kingdom, and with that ended the discourse. Here, however, he offers a very powerful exhortation.
A man who assigns punishments for sin but does not show that sin is very grave will accomplish nothing important through punishments. Likewise, one who only exhorts and does not frighten with punishments will not greatly move the insensible.
Therefore Paul does both. He admonishes with the words, "Do you not know that we shall judge angels?" (1 Cor 6:3). He frightens with the words, "Do you not know that ... the covetous ... will not inherit the Kingdom of God?" (1 Cor 6:9-10).
In the same way he also speaks against the incestuous man. Having removed him by what was said earlier, excommunicated him, delivered him to Satan, and recalled the future day, he now admonishes.
"Do you not know that your bodies are members of Christ?" He speaks with them as with noble children.
Above he said, "the body is for the Lord" (1 Cor 6:13). Now he explains this more precisely, as he does elsewhere when he says, "You are the Body of Christ, and members individually" (1 Cor 12:27).
He uses this comparison in many places, though not with one and the same meaning. Sometimes it expresses love, and sometimes it intensifies fear. Here he uses it to instill fear and horror.
"Shall I then take the members of Christ and make them members of a harlot? May it not be."
Nothing can be more fearful than these words. He did not say, "Shall I therefore take the members from Christ" and join them to a harlot. What did he say? "To make them members of a harlot."
This expression is far more striking.