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