Good and Evil Thoughts

A genius born in heaven, burdened with a blood feud. When you escape into Buddhism, you should be devoted to good deeds. Tossing and turning, drifting between good and evil. The enemy bowed his head, but there was no fight in his heart. As a monk who is supposed to save all sentient beings, how does Yan Zhi face the hatred in his heart? Is the relationship between good and evil really incompatible, or is it just a matter of thought?