Come, now, if he had not "wholly saddened" so many persons in the first Epistle; if he had "rebuked" none, had "terrified" none; if he had "smitten" the incestuous man alone; if, for his cause, he had sent none into panic, had struck (no) "inflated" one with consternation,-would it not be better for you to suspect, and more believing for you to argue, that rather some one far different had been in the same predicament at that time among the Corinthians; so that, rebuked, and terrified, and already wounded with mourning, he therefore-the moderate nature of his fault permitting it-subsequently received pardon, than that you should interpret that (pardon as granted) to an incestuous fornicator? For this you had been bound to read, even if not in an Epistle, yet impressed upon the very character of the apostle, by (his) modesty more clearly than by the instrumentality of a pen: not to steep, to wit, Paul, the "apostle of Christ," the "teacher of the nations in faith and verity," the "vessel of election," the founder of Churches, the censor of discipline, (in the guilt of) levity so great as that he should either have condemned rashly one whom he was presently to absolve, or else rashly absolved one whom he had not rashly condemned, albeit on the ground of that fornication which is the result of simple immodesty, not to say on the ground of incestuous nuptials and impious voluptuousness and parricidal lust,-(lust) which he had refused to compare even with (the lusts of) the nations, for fear it should be set down to the account of custom; (lust) on which he would sit in judgment though absent, for fear the culprit should "gain the time; " (lust) which he had condemned after calling to his aid even "the Lord's power," for fear the sentence should seem human.
"But that I may not seem as if I would terrify you: for his letters, say they, are weighty and strong: but his bodily presence is weak, and his speech of no account. Let such a one reckon this, that what we are in word by letters when we are absent, such are we also in deed when we are present."
What he says is this: 'I could boast indeed, but that they may not say the same things again, to wit, that I boast in my letters, and am contemptible when present, I will say nothing great.' And yet afterwards he did say something great, but not about this power by which he was formidable, but about revelations and at greater lengths about trials. 'Therefore, that I may not seem to be terrifying you, "let such an one reckon this, that what we are by letters when we are absent, such are we also in deed when we are present.'" For since they said, 'he writes great things of himself, but when he is present he is worthy of no consideration,' therefore he says these things, and those again in a moderated form. For he did not say, 'as we write great things, so when we are present we also do great things,' but in more subdued phrase. For when he addressed himself to the others indeed, he stated it with vehemency, saying, "I beseech you that I may not when present show courage with the confidence wherewith I think to be bold against some:" but when to these, he is more subdued. And therefore he says, 'what we are when present, such too when absent, that is, lowly, modest, no where boasting.
[AD 220] Tertullian on 2 Corinthians 10:9