2 Peter 1:12; 2 Peter 3:16

12 Wherefore I will not be negligent to put you always in remembrance of these things, though ye know them, and be established in the present truth.

16 As also in all his epistles, speaking in them of these things; in which are some things hard to be understood, which they that are unlearned and unstable wrest, as they do also the other scriptures, unto their own destruction.