"It's always good in science to say "Well how do you know that?" and "Are you really sure?" and "Could there be an exceptional case?""

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Speaking as somebody who's been in the drug scene, it's not something you can go on and on doing, you know. It's like drink, or anything, you've got to come to terms with it. You know, like too much food, or too much anything. You've got to get out of it. You're left with yourself all the time, whatever you do--you know, meditation, drugs or anything. But you've got to get down to your own god and your own temple in your head.

— John Lennon