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

The key to performance is elegance, not battalions of special cases.

一本好书是一个永远不会让你失望的朋友。

书籍是最安静且最恒久的朋友。

I’ve had my best years after fifty. Age is just a number—it’s your attitude that counts. 

【解释】春夏和暖万物生长，秋冬寒冷万物没有生机。人性情高傲冷漠，福分就淡薄，个性温和热情助人的人，福泽会丰厚。

And what I noted, since the really big ideas carry 95 percent of the freight, it wasn’t at all that hard for me to pick up all the big ideas and all the big disciplines and make them a standard part of my mental routines. Once you have the ideas, of course, they are no good if you don’t practice. You don’t practice, you lose it.