Wiktionary
know one's mind
vb. (alternative form of know one's own mind English)
Usage examples of "know one's mind".
Because to know one's mind means that one will not do anything for a harebrained reason, or trip oneself up because of uncertainty or second-guessing.
Because to know one's mind means that one will not do anything for a harebrained reason, or trip one-self up because of uncertainty or second-guessing.