The commonest error is to try to produce and manufacture intuition. That can't be done. It is something which comes to you. Hence don't expect it to appear when concentrating on a problem, but if at all after you've dismissed the problem. Even then it is a matter of grace--it may or may not come.
-- Notebooks Category 22: Inspiration and the Overself > Chapter 1: Intuition the Beginning > # 73
-- Perspectives > Chapter 22: Inspiration and the Overself > # 34