Cross reference
Jude 1:10
10 But these speak evil of those things which they know not: but what they know naturally, as brute beasts, in those things they corrupt themselves.
2 Peter 2:12
12 But these, as natural brute beasts, made to be taken and destroyed, speak evil of the things that they understand not; and shall utterly perish in their own corruption;
Romans 1:21-22
21 Because that, when they knew God, they glorified him not as God, neither were thankful; but became vain in their imaginations, and their foolish heart was darkened.
22 Professing themselves to be wise, they became fools,