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當一扇幸福的門關起的時候，另一扇幸福的門會因此開啟，但我們卻經常看這扇關閉的大門太久，而忘了注意到那扇已經為我們而開啟的幸福之門。

譯文：學習、詢問、思考、辨析、實踐，都是做學問的方法，沒有只學習而不實踐的。

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

The only way to save a rhinoceros is to save the environment in which it lives, because there's a mutual dependency between it and millions of other species of both animals and plants.

自由就是對自己負責。