For it is a shame even to speak of those things
This is a reason, why persons should walk as children of light; why they should prove what is acceptable to God; why they should have no fellowship with the unfruitful works of darkness; why the apostle exhorts to reprove them, and yet does not express what they are; and why they should be reproved rather by deeds than by words: and he tacitly intimates, that if it is a shame to speak of those sins
which are done of them in secret,
it is much more shameful to commit them; the persons the apostle refers to, are the unconverted Gentiles in general; such who have no inheritance in the kingdom of God, who deceive men with vain words, who are children of disobedience, who are in darkness, and destitute of the Spirit; and it may be that respect may be had to the followers of Simon Magus, the Gnostics, and such like impure professors, by whom the vilest things were done in secret; for sins, works of darkness, will not bear the light; there is a consciousness in men of the evil of sin, unless past feeling, and therefore they do not care that others should know their crimes; and besides, there is an imaginary pleasure in committing sin secretly; but then though these things are secret to men, they are not to God; nor will they always remain secrets, they will be brought to light, and therefore no fellowship should be had with them; and especially when they are of such a scandalous nature, that it is a shame to mention the very names of them.