know one's own mind, to

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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
The American Heritage® Dictionary of Idioms by Christine Ammer. Copyright © 2003, 1997 by The Christine Ammer 1992 Trust. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

know one's own mind, to

To be certain of one’s opinions or plans; to be self-assured. This term has been known since about 1700. Jonathan Swift included it in Polite Conversation (1738), “You don’t know your own mind,” an accusation still often voiced in just this way.
See also: know, own
The Dictionary of Clichés by Christine Ammer Copyright © 2013 by Christine Ammer
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References in classic literature ?
The first point to be obtained is to know one's own mind. Once sure of that, and where women are concerned it is not easy, the next is, to act up to the decision.