From Longman Dictionary of Contemporary Englishfind it in your heart/yourself to do somethingfind it in your heart/yourself to do somethingliterary to feel able or willing to do something Seb could not find it in his heart to tell Nahum. → find
Examples from the Corpus
find it in your heart/yourself to do something• For this alone, I may find it in my heart to forgive her.• He hoped the moon could find it in its heart to overlook his sins as it climbed the heavens.• To his grief, Donny's widow would not find it in her heart to speak to him again. 