On Evil

"All of this took time, and for most of it I was completely alone. When you're removed from human society for that long, especially if you're intoxicated, ordinary moral inhibitions begin to lose their grip. It's not that you deny the concept of evil, it's that you begin to find it acceptable, even attractive. You start to wallow in it: you ignore the consequences and concentrate on the fun parts.

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Matt Ruff
Bad Monkeys

The Penseive

Albus Dumbledore: Harry Potter and the Goblet of Fire: Quotes
I sometimes find, and I am sure you know the feeling, that I simply have too many thoughts and memories crammed into my mind... At these times... I use the Pensieve. One simply siphons the excess thoughts from one's mind, pours them into the basin, and examines them at one's leisure.

From:

http://quotations.about.com/od/harrypotterquotations/a/HarryPotter4.htm