Adam Clarke's Commentary on the Bible - 2 Peter 1:21
For the prophecy came not in old time - That is, in any former time, by the will of man - by a man's own searching, conjecture, or calculation; but holy men of God - persons separated from the world, and devoted to God's service, spake, moved by the Holy Ghost. So far were they from inventing these prophetic declarations concerning Christ, or any future event, that they were φερομενοι , carried away, out of themselves and out of the whole region, as it were, of human knowledge and... read more
Adam Clarke's Commentary on the Bible - 2 Peter 1:20
Knowing this first - Considering this as a first principle, that no prophecy of the Scripture, whether that referred to above, or any other, is of any private interpretation - proceeds from the prophet's own knowledge or invention, or was the offspring of calculation or conjecture. The word επιλυσις signifies also impetus, impulse; and probably this is the best sense here; not by the mere private impulse of his own mind. read more