preserve my sanity, for to this I am reduced. Safety and the assurance of safety are things of the past. Whilst I live on here there is but one thing to hope for, that I may not go mad, if, indeed, I be not mad already. If I be sane, then surely it is maddening to think that of all the foul things that lurk in this hateful place.

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.

To feel our character, our personality, and our personal, hard-won history fade from being is to be exposed to whatever lies beneath these comforting, operational conveniences. What remains when the conscious and functioning self has been erased is mankind's fundamental condition _ irrational, violent, guilt-wracked, despairing, and mad.

When she had died, his anchor was gone and the world had burned from his untethered insanity.

(there is) no other means of escaping from one's consciousness than to deny it, to look upon it as an organic disease of the terrestrial intelligence - a disease which we must endeavor to cure by an action which must appear to us an action of violent and willful madness, but which, on the other side of our appearances, is probably an action of health. ("Of Immortality")

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.