Quote 10
"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.
Quote 11
"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.