On understanding.........................

I often use the analogy of a chess game: one can learn all the rules of chess, but one doesn’t know how to play well. The present situation in physics is as if we know chess, but we don’t know one or two rules. But in this part of the board where things are operation, those one or two rules are not operating much and we can get along pretty well without understanding those rules. That’s the way it is, I would say, regarding the phenomena of life, consciousness and so forth.
-Richard P. Feynman