“For a long time I was continually putting off the next step in my exploration because I felt I ought to know more, knew there were many books written about these things, felt that I must read them all before I could go any further. Whenever I gave in to this impulse I found it disastrous. It took me years to learn that I must never begin my search by looking in books, never say, ‘I know too little, I must read some more before I start’, but that I must always observe first, express what I observed, and then, if I needed it, see what the books had to say.”