If there is a problem you can't solve, then there is an easier problem you can't solve: find it.
There are many questions which fools can ask that wise men cannot answer.
When introduced at the wrong time or place, good logic may be the worst enemy of good teaching.
A GREAT discovery solves a great problem but there is a grain of discovery in any problem.
Mathematics consists in proving the most obvious thing in the least obvious way.
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