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 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 ?
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.
Rodney seems to know his own mind well enough," he said almost bitterly.
But the son was old enough to know his own mind, the detective said.
But Jimmy still doesn't know his own mind - he wants to have his cake and eat it.
A YOUR son is old enough to know his own mind - as is your friend.
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.
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.