21 For prophecy never had its origin in the human will, but prophets, though human, spoke from God as they were carried along by the Holy Spirit.

Read 2 Peter 1:21 Using Other Translations

For the prophecy came not in old time by the will of man: but holy men of God spake as they were moved by the Holy Ghost.
For no prophecy was ever produced by the will of man, but men spoke from God as they were carried along by the Holy Spirit.
or from human initiative. No, those prophets were moved by the Holy Spirit, and they spoke from God.