最有力的艺术往往是最谦逊的。

The heart has its reasons, which reason does not know.

To teach mathematics is to inspire the next generation of thinkers and problem solvers.

"Writing is easy: all you do is sit staring at a blank sheet of paper until drops of blood form on your forehead."

It is not shame for a man to learn that which he knows not，whatever his age.

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