We begin with the hypothesis that any subject can be taught effectively in some intellectually honest form to any child at any stage of development.

大自然是有史以来最伟大的化学家，而我们才刚刚开始理解它的秘密。

I can’t play bridge. I don’t play tennis. All those things that people learn, and I admire, there hasn’t seemed time for. But what there is time for is looking out the window.

最好的果实来自于耐心、细心和对自然时机的尊重。