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生命中最伟大的事情是保持心灵年轻。
To write is to bear witness to the world and to oneself.
In mathematics, you don't understand things. You just get used to them.
The question is, are we happy to suppose that our grandchildren may never be able to see an elephant except in a picture book?
Reason is the soul of the law; the reason of the law is the soul.
There is pleasure in the pathless woods.