And his knowledge remained woefully incomplete, Harry! 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.

I never thought I'd hear myself say it, but safety first!

Death comes for us all in the end.

Harry, just go down to the lake tomorrow, right, stick your head in, yell at the merpeople to give back whatever they’ve nicked, and see if they chuck it out. Best you can do, mate.

The world had ended, so why had the battle not ceased, the castle fallen silent in horror, and every combatant laid down their arms? Harry's mind was in freefall, spinning out of control, unable to grasp the impossiblity, because Fred Weasley could not be dead, the evidence of all his senses must be lying -

Humans have a knack for choosing precisely the things that are worst for them.

It is impossible to live without failing at something, unless you live so cautiously that you might has well not have lived at all, in which case you have failed by default.