A man of quick temper acts foolishly, and a man of evil devices is hated.
#proverbs 14:17

If you can't control your temper, it will control you.

The Hebrew word for evil devices literally means schemes and is even sometimes translated as "discretion". Schemers collect enemies because people learn not to trust them. See the simple and prudent in v15-16. Fools hate schemers because they have been fooled. The wise distrust schemers because of their schemes.