John Chrysostom

Next, what is strongest of all he puts last, saying, "God ordains these things even at this time by me." "If any man thinketh himself to be a prophet, or spiritual, let him take knowledge of the things which I write unto you that they are the commandments of the Lord. But if any man is ignorant, let him be ignorant." And wherefore did he add this? Intimating that he is not using violence nor contention, which is a sign of them who wish not to set up their own things, but aim at what is profitable to others. …

Homily on 1 Corinthians 37 ↗

Theophylact of Ohrid

He placed at the end what is strongest of all, namely, that God commands this through me, and this is undoubtedly recognized by the one who among you is regarded as a prophet or as having some other spiritual gift, for example, the gift of knowledge.

Commentary on 1 Corinthians ↗

Thomas Aquinas

Then when he says: If anyone thinks that he is a prophet or spiritual, he refutes the greater ones in particular. In regard to this he does two things: first, he refutes them; secondly, he answers a tacit objection (v. 38). He says, therefore: Suppose that the entire Church does not contradict, except someone who seems to be a prophet. He says, seems, because, if he contradicts, he is not really a prophet or wise or spiritual, because many are spiritual who are not prophets, although all prophets are spiritual. …

Commentary on 1 Corinthians ↗