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What other dungeon is so dark as one's own heart. What jailer so inexorable as one's self?
Nathaniel Hawthorne

We learn by teaching.
Traditional Proverb

Since the mathematicians have invaded the theory of relativity I do not understand it myself any more.
Einstein

Except in math, the shortest distance between point A and point B is seldom a straight line.
Platon

What little Hans didn't learn, big Hans doesn't know.
German Proverb

Pure math is, in its way, the poetry of logical ideas.
Max Wilhelm Dehn

Pure math is, in its way, the poetry of logical ideas.
Roger Bacon

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