Snape looked horrified. 'You have kept him alive so that he can die at the right moment?''Don't look shocked, Severus. How many men and women have you watched die?''Lately, only those whom I could not save', said Snape.

Potter is mocked by a faculty member for the idea that there is evil in the world from which even children need to learn to defend themselves by the actual practice of doing so rather than familiarity with theory.

Now you see. We are all fugitives. We have always been fugitives from the void. Whatever comfort, whatever power we gain from outside of ourselves diminishes us -- because comfort and power, unless they are won from the void inside of us, are illusions that make us forget the emptyness that carries us. When we forget that, we believe we deserve comfort and power and so are capable of any evil. We deserve nothing but what we make of ourselves. We deserve nothing else. And when we understand that, then nothing is enough.

It was important, Dumbledore said, to fight, and fight again, and keep fighting, for only then could evil be kept at bay, though never quite eradicated. . . .

I know [Umbridge] by reputation and I'm sure she's no Death Eater-""She's foul enough to be one...""Yes, but the world isn't split into good people and Death Eaters.

It is impossible to manufacture or imitate love.