John Chrysostom

"But I will come to you," saith he, "when I shall have passed through Macedonia." This he had said also above; then however with anger: at least he added, "And I will know not the speech of them that are puffed up, but the power:" but here, more mildly; that they might even long for his coming. Then, that they might not say, "Why is it that you honor the Macedonians above us?" he said not, "When I depart," but, "When I shall have passed through Macedonia; for I do pass through Macedonia."

Homily on 1 Corinthians 43 ↗

Theophylact of Ohrid

He did not say: I will go to Macedonia, lest they say: "you prefer the Macedonians to us," but said: I am passing through Macedonia, that is, I am visiting the Macedonians hastily and in passing, but with you I will stay. By this he shows that he prefers them to the Macedonians, as disciples most sincere and most worthy; for the church of Corinth was great. By the word "stay" he frightens those who were sinning. He adds "if the Lord permits" because of uncertainty. …

Commentary on 1 Corinthians ↗

Thomas Aquinas

Next, the Apostle instructs them about the things that pertain to himself. And concerning this he does three things. First, he promises them his arrival, saying, I will come to you after passing through Macedonia. Secondly, he says that he is about to spend a long time with them; thirdly, he excuses the postponement of his arrival. Concerning the first it should be understood that, as it says in Ac. …

Commentary on 1 Corinthians ↗