Harry Potter and the Deathly Hallows
How we cite our quotes:
"That which Voldemort does not value, he takes no trouble to comprehend. Of house-elves and children's tales, of love, loyalty, and innocence, Voldemort knows and understands nothing. Nothing. That they all have a power beyond his own, a power beyond the reach of any magic is a truth he has never grasped." (35.28)
Ah… so, real power, it seems, springs from love, something Dumbledore has said all along, but that Voldemort has never listened to. And this is why Harry triumphs over the Dark Lord in the end; he recognizes, unlike his foe, that he isn't alone in the world and wouldn't want to be, and that it's love that makes the world go 'round.
"Maybe a man in a million could unite the Hallows, Harry. I was fit only to possess the meanest of them, the least extraordinary. I was fit to own the Elder Wand, and not to boast of it, and not to kill with it. I was permitted to tame and to use it, because I took it, not for gain, but to save others from it.
"But the Cloak, I took out of vain curiosity, and so it could never have worked for me as it works for you, its true owner. The stone I would have used in an attempt to drag back those who are at peace, rather than to enable my self-sacrifice, as you did. You are the worthy possessor of the Hallows." (35.84-85)
Dumbledore recognizes wisely that power works best for those who deserve it – he could never have controlled all three Hallows because he never merited them. This is something that Voldemort, who thinks he can seize whatever power he wants, will never understand.
"I'm putting the Elder Wand," he told Dumbledore, who was watching him with enormous affection and admiration, "back where it came from. It can stay there. If I die a natural death like Ignotus, its power will be broken, won't it? The previous master will never have to be defeated. That'll be the end of it.
Dumbledore nodded. They smiled at each other.
"Are you sure?" said Ron. There was the faintest trace of longing in his voice as he looked at the Elder Wand.
"I think Harry's right," said Hermione quietly.
"That wand's more trouble than it's worth," said Harry. "And quite honestly… I've had enough trouble for a lifetime." (36.147-150)
Harry shows true power of a sort here – the ability to say "no" to having too much power, if that makes sense. His decision to break the pattern of the Elder Wand and to lay it to rest again in Dumbledore's tomb proves his worthiness in ever possessing the Hallows; he knew when to use them, and when to stop.