John Chrysostom

"But I call God for a witness upon my soul, that to spare you I forbare to come unto Corinth." What sayest thou, O blessed Paul? To spare them thou camest not to Corinth? Surely thou presentest us with something of a contradiction. For a little above thou saidst that thou therefore camest not, because thou purposest not according to the flesh nor art thine own master, but art led about every where by the authority of the Spirit, and didst set forth thine afflictions. …

Homily 4 on 2 Corinthians ↗

Theophylact of Ohrid

Above he said that he did not come to them because he did not have authority over himself and was not permitted by the Spirit. How then does he now say that he did not come in order to spare them? Because either this very thing happened by the will of the Spirit, that is, the Spirit suggested to him the thought of not going in order to spare them, or — at first the Spirit forbade him, and then he himself, having reasoned that this was better, remained. Note the wisdom of the apostle. …

Commentary on 2 Corinthians ↗

Thomas Aquinas

Then he says, but I call God to witness, he gives his excuse for not coming; and this is by oath which is greater. In regard to this he does three things: first, he states the excuse; secondly, he answers a tacit question (v. 24a); thirdly, he explains what he says (v. 24b). He excuses himself with a double oath: one of attestation, when he says, I call God to witness; the other of execration, when he says, against me, i.e., against my soul: "For God is my witness" (Rom. 1:9). …

Commentary on 2 Corinthians ↗