理解他人，现实的唯一方法是自己去体验。

做数学就是探索一个无限的思想景观。

"When I approach a child, he inspires in me two sentiments; tenderness for what he is, and respect for what he may become."

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.

You pray for rain, you gotta deal with the mud too. That's a part of it.

儿童的进步不是取决于年龄，而是取决于能够自由地观看他周围的一切。