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In mathematics, you don't understand things. You just get used to them.

I like to be challenged. I like to do things that people say I can't do.

The hardest thing is to live richly in the present without letting it be tainted by the past or future.

Every aspect of learning or any other feature of intelligence can in principle be so precisely described that a machine can be made to simulate it.

譯文：有錢人家習慣了奢侈無度，教導子弟卻成了難事；貧窮人家要謀生計，還是要靠讀書獲得出路。賞析：衣食無憂的家庭雖然能給孩子提供良好的物質條件，但也最容易讓孩子養成窮奢極侈的作風。讀書也許不是人生唯一的出路，但卻是普通人最好走的那條路，這條路成本最低。

唯一把我們和動物區分開的是我們裝飾自己的能力。

The true genius shudders at incompleteness — and usually prefers silence to saying something which is not everything it ought to be.