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The best time to work on your marriage is before you have one.

The question is not whether the thing exists， but whether it has any essence which is capable of existence without us.

We are not in the coffee business serving people, but in the people business serving coffee.

數學不是一門演繹科學——那是陳詞濫調。當你試圖證明一個定理時，你不僅僅是列出假設然后開始推理。你所做的是反復試驗、實驗和猜測。

人不是為失敗而生。一個人可以被毀滅，但不能給打敗。

The right of nature... is the liberty each man hath, to use his own power, as he will himself, for the preservation of his own nature; that is to say, of his own life.

I don't like being defined because I'm ever-changing.