From Longman Dictionary of Contemporary Englishknow your own mindknow your own mindINDEPENDENT PERSONto be confident and have firm ideas about what you want and like → know
Examples from the Corpus
know your own mind• People often didn't know their own minds.• You don't know your own mind.• Though not yet 15, Sara knows her own mind, and has already decided on a career.• All of which suggests a person who knows his own mind and makes his own decisions.• I'm in my mid-thirties and ought to know my own mind by now, but I'm scared of getting married.• He hardly knew his own mind, they said candidly among their own intimates.• Shirley giggled and said I was a woman who knew her own mind, wasn't I, Jim? 