Theophylact of Ohrid

"For prophecy never came by the will of man" (2 Pet. 1:21), this means: the prophets received prophecy from God, but not as they willed, but as the Spirit of God acted; they were conscious of and comprehended the prophetic word sent down to them, but they did not provide an explanation of it. …

Commentary on 2 Peter ↗

Bede

For prophecy never came by the will of man, etc. They could always foretell the future; but the Spirit itself filled their hearts whenever it wished; thus, it was not in their power to teach whatever they wanted, but they spoke only what they had learned, enlightened by the Spirit. We say this so that no one may dare to interpret the Scriptures according to their own will. …

Commentary on the Catholic Epistles ↗

Hippolytus of Rome

For as the blessed prophets were made, so to speak, eyes for us, they foresaw through faith the mysteries of the word, and became ministers of these things also to succeeding generations, not only reporting the past, but also announcing I the present and the future, so that the prophet might not appear to be one only for the time being, but might also predict the future for all generations, and so be reckoned a (true) prophet. …

Fragments - Dogmatic and Historical ↗