The fountain of content must spring up in the mind, and they who have so little knowledge of human nature as to seek happiness by changing anything but their own dispositions will waste their lives in fruitless efforts.

我想我是不敢开心了，因为每次都会乐极生悲。

The only way to do great work is to love what you do.

生命很短暂，没有时间争吵和争斗，我的朋友。