My journals are not written for others, nor do I usually look at them myself, but they are a special, indispensable form of talking to myself. The need to think on paper is not confined to notebooks. It spreads onto the backs of envelopes, menus, whatever scraps of paper are at hand. And I often transcribe quotations I like, writing or typing them on pieces of brightly colored paper and pinning them to a bulletin board. 

OLIVER SACKS