find it in one's heart
Persuade oneself to do something, as in They were an hour late, but I couldn't find it in my heart to scold them. This expression, today generally put in the negative, alludes to searching self-examination. [Mid-1400s]
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The American Heritage® Idioms Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.