"The most powerful life is the most simple life. The most powerful life is the life that knows where it's going, that knows where the source of strength is; it is the life that stays free of clutter and happenstance and hurriedness."

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But in physics I soon learned to scent out the paths that led to the depths, and to disregard everything else, all the many things that clutter up the mind, and divert it from the essential. The hitch in this was, of course, the fact that one had to cram all this stuff into one's mind for the examination, whether one liked it or not.

— Albert Einstein