从前庄周梦见自己变成蝴蝶，一只翩翩飞舞、快乐自由的蝴蝶。不知道自己本是庄周。顷刻间醒来，惊疑地发现自己仍是庄周。不知是庄周做梦变成蝴蝶，还是蝴蝶做梦变成庄周。庄周与蝴蝶终究是不一样的。这就叫“物化”。

The mathematician's best work is art, a high perfect art, as daring as the most secret dreams of imagination, clear and limpid.

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.