贫贱是苦境，能善处者自乐；富贵是乐境，不善处者更苦。
贫贱是苦难的境界，能很好地居于其境者就苦中有乐；富贵是快乐的境地，不能很好地对待富贵的人便会乐极生悲。
我不怕失败，最怕的是没试过。
Mathematics is the art of giving the same name to different things.
家不是一个地方，而是一种感觉。
The key to understanding life is to understand the interactions between its components.
The greatest glory in living lies not in never falling, but in rising every time we fall.