What does charlie say about the process of the mind and how to work around a problem?

From the text:

"Fortunately, I know enough about the processes of the mind not to let this block worry me too much. Instead of panicking and giving up (or what's even

worse, pushing hard for answers that won't come) I've got to take my mind off the problem for a while and let it stew. I've gone as far as I can on a conscious

level, and now it's up to those mysterious operations below the level of awareness. It's one of those inexplicable things, how everything I've learned and experienced is brought to bear on the problem. Pushing too hard will only make things freeze up. How many great problems have gone unsolved because men didn't know enough, or have enough faith in the creative process and in themselves, to let go for the whole mind to work at it?"