Oliver Sacks on keeping a diary

 Sacks writes:
I started keeping journals when I was fourteen and at last count had nearly a thousand. They come in all shapes and sizes, from little pocket ones which I carry around with me to enormous tomes. I always keep a notebook by my bedside, for dreams as well as nighttime thoughts, and I try to have one by the swimming pool or the lakeside or the seashore; swimming too is very productive of thoughts which I must write, especially if they present themselves, as they sometimes do, in the form of whole sentences or paragraphs…
But for the most part, I rarely look at the journals I have kept for the greater part of a lifetime. The act of writing is itself enough; it serves to clarify my thoughts and feelings. The act of writing is an integral part of my mental life; ideas emerge, are shaped, in the act of writing.
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.
Dr. Sacks captures a thought in his journal at Amsterdam's busy train station (Photograph: Lowell Handler)
He adds:
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.
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