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That quote is very very good. I imagine it a bit like mathematics (perhaps it's just me though) in the beginning of learning a new concept, one might get the feeling of being "stuck" or confused. This feeling is very uncomfortable, but you always encounter it and never can figure out why you are always feeling this way. Suddenly, one day after a brisk walk or a good nights sleep, the concept becomes clear! You have figured out the problem that was preventing you from solving the actual problem! From then on, you can apply that problem to other problems.