"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."
-- Albus Dumbledore, Harry Potter and the Goblet of Fire (J.K. Rowling)