2 Corinthians 13:1

The wisdom of Paul and his much tender affection, one may observe in many other circumstances, but especially in this, his being so abundant and vehement in his admonitions, but so tardy and procrastinating in his punishments. For he did not chastise them immediately on their sinning, but warned them once and again; and not even so, upon their paying no attention, does he exact punishment, but warns again, saying, "This is the third time I am coming to you;" and "before I come I write again." Then, that his procrastinating may not produce indifference, see how he corrects this result also, by threatening continually and holding the blow suspended over them, and saying, "If I come again I will not spare;" and "lest when I come again I should mourn for many." These things, then, he doeth and speaketh, in this too imitating the Lord of all: because that God also threateneth indeed continually and warneth often, but not often chastiseth and punisheth. And so in truth also doth Paul, and therefore he said also before, "To spare you I came not as yet to Corinth." What is, "to spare you?" Lest finding you to have sinned and to continue unamended, I should visit with chastisement and punishment. And here, "This is the third time I am coming to you. At the mouth of two witnesses or three shall every word be established."

He joins the unwritten to the written, as he has done also in another place, saying, "He that is joined to an harlot is one body; for the twain," saith He, "shall become one flesh." Howbeit, this was spoken of lawful marriage; but he diverted its application unto this thing conveniently, so as to terrify them the more. And so he doth here also, setting his comings and his warnings in the place of witnesses. And what he says is this: "I spoke once and again when I was with you; I speak also now by letter. And if indeed ye attend to me, what I desired is accomplished; but if ye pay no attention, it is necessary henceforth to stop speaking, and to inflict the punishment."