Success is not the key to happiness. Happiness is the key to success. If you love what you are doing, you will be successful.

成功不在于你赚了多少钱，而在于你影响了多少人的生活。

"To write is to bear witness to the human condition."

我不为观众写作。我为自己写作。

"I don't run for money. I run for the love of the sport."

The truth is, the science of Nature has been already too long made only a work of the brain and the fancy: It is now high time that it should return to the plainness and soundness of observations on material and obvious things.

【讲解】：发奋时候竟忘记吃饭，快乐时候就忘记了忧愁，把自己就要老了这件事也不放在心上，如此罢了。”