John Calvin on 2 Peter 1:21

But holy men of God spake as they were moved by the Holy Ghost. They did not of themselves, or according to their own will, foolishly deliver their own inventions. The meaning is, that the beginning of right knowledge is to give that credit to the holy prophets which is due to God. He calls them the holy men of God, because they faithfully executed the office committed to them, having sustained the person of God in their ministrations. He says that they were — not that they were bereaved of mind, (as the Gentiles imagined their prophets to have been,) but because they dared not to announce anything of their own, and obediently followed the Spirit as their guide, who ruled in their mouth as in his own sanctuary. Understand by prophecy of Scripture that which is contained in the holy Scriptures.

CHAPTER 2

2 Peter 2:1-3

1. But there were false prophets also among the people, even as there shall be false teachers among you, who privily shall bring in damnable heresies, even denying the Lord that bought them, and bring upon themselves swift destruction.

1. Fuerunt autem et falsi prophetae in populo, sicuti et inter vos erunt falsi doctores, qui subinducent sectas perditionis, et etiam Dominum qui eos redemit abnegantes, accersentes sibi celerem interitum.

2. And many shall follow their pernicious ways; by reason of whom the way of truth shall be evil spoken of.

2. Et multi sequentur eorum exitia, per quos via veritatis blasphemabitur;

3. And through covetousness shall they with feigned words make merchandise of you: whose judgment now of a long time lingereth not, and their damnation slumbereth not.

3. Et in avaritia fictis sermonibus de vobis negotiabuntur; quorum judicium pridem non cessat, et quorum perditio non dormitat.