search one's heart
Анализировать чьи-л. мотивы и действия; пытаться понять был ли кто-л. или поступок справедлив и честен.
The teacher searched his heart trying to decide if he had been unfair in failing Tom.
After much heart-searching, Jean told Beth she was sorry for the unkind things she had said.
The minister preached a soul-searching sermon about the thoughtless ways people hurt each other.