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When you are young, you think that the world is a place where you can live as you choose. But as you get older, you realize that the world is a place where you have to live as you must.

數學不是一項觀賞性運動。你必須參與其中。

"Beauty will save the world, but only if it is truthful beauty."

The secret of happiness is to see all the marvels of the world, and never to forget the drops of oil on the spoon.