“But before you try to kill me, I’d advice you to think about what you’ve done. . . . Think, and try for some remorse, Riddle. . . .”

“What is this?”

Of all the things that Harry had said to him, beyond any revelation or taunt, nothing had shocked Voldemort like this. Harry saw his pupils contract to thin slits, saw the skin around his eyes whiten.

“It’s your one last chance,” said Harry, “it’s all you’ve got left. . . . I’ve seen what you’ll be otherwise. . . . Be a man . . . try . . . Try for some remorse. . . .”

Harry Potter and the Deathly Hallows – J.K. Rowling