Matthew Henry Presbyterian @wholebiblehenry

Here is, 1. The good character of a wise and virtuous man implied. He is one that has rule over his own spirit; he maintains the government of himself, and of his own appetites and passions, and does not suffer them to rebel against reason and conscience. He has the rule of his own thoughts, his desires, his inclinations, his resentments, and keeps them all in good order. 2.

Jamieson-Fausset-Brown Reformed @jfbcommentary

Such are exposed to the incursions of evil thoughts and successful temptations. Next: Proverbs Chapter 26

Geneva Bible Notes Reformed @genevanotes

He that [hath] no rule over his own spirit [is like] a city [that is] broken down, [and] without walls. (q) And so is in extreme danger.