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Mathematics is the art of giving the same name to different things.

經驗只是我們給錯誤取的名字。

"The world is changed by your example, not by your opinion."

Be prepared: When you are 90% done any large project (a house， a film， an event， an app) the rest of the myriad details will take a second 90% to complete.

你叫不醒一個裝睡的人。