know (one's) own mind

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know (one's) own mind

To be firmly resolute and confident in one's ideas, intentions, plans, or opinions. I've never worried too much about the effects of peer pressure on Kelly, as she really knows her own mind on what's right or wrong.
See also: know, mind, own

know one's own mind

Be certain about what one wants; be decisive. For example, Don't ask him; he's so tired that he doesn't know his own mind, or She certainly knows her own mind when it comes to giving stage directions. This term was first recorded in 1824.
See also: know, mind, own

know your own mind

be decisive and certain.
See also: know, mind, own

know your own ˈmind

know what you want or like: At 25 you’re old enough to know your own mind and make these decisions for yourself.
See also: know, mind, own
References in classic literature ?
Philip was not sorry to see him off, for he was a downright person and it irritated him that anybody should not know his own mind.
As to Captain Wentworth's views, she deemed it of more consequence that he should know his own mind early enough not to be endangering the happiness of either sister, or impeaching his own honour, than that he should prefer Henrietta to Louisa, or Louisa to Henrietta.
Putting her head on one side, Margaret then remarked, "To me one of two things is very clear; either God does not know his own mind about England and Germany, or else these do not know the mind of God.
Maybe he doesn't know his own mind, or maybe he's just a player and his ego is so big he decided to reel you back in and when he knew you
But the only truly offensive aspect of this whole overblown kerfuffle is the undignified, grovelling apology which can only come from a man who either does not know his own mind or is a complete wimp.
John is a canny veteran of the publishing game who also happens to know his own mind and makes decisions, in most cases, pretty much on the basis of an instinctive hunch that takes in at the same time his very specific aesthetic tastes and his absolute understanding of the bottom line.
A YOUR son is old enough to know his own mind - as is your friend.
But Jimmy still doesn't know his own mind - he wants to have his cake and eat it.
I don't know the answer to why they split but I do know Murray (right) is one of the best young players in the world and a kid who seems to know his own mind.