I don't think about age. I think about people's spirit and energy and if they're positive and if they're fun to be around.

The most important thing is to awaken in the child his own will and ability to create.

如果你仔细观察，平凡的事物也会变得非凡。

我不敢说数学和疯狂之间有直接关系，但毫无疑问，伟大的数学家都具有狂热的特质。

人一生有两个最重要的日子，一是出生的那天，二是发现你为何而生的那天。