There is an old standard saying about the arts:

There is an old standard saying about the arts: ‘You need to learn all the rules, and then forget them’ … In writing a book, you are moving along on the wave of your inspiration and intuition, and then you come to a difficult passage, an area you have to cover in order to get from here to there, and your momentum stops. That’s when you have to bring in the rules.

-- Joseph Campbell
Find more quotations at www.jcf.org/quotes