We don't stop playing because we grow old; we grow old because we stop playing.

教育的首要目标是培养能够做新事情的人，而不仅仅是重复前几代人所做的事情。

I never saw a problem that I did not attempt to solve by mechanical means.

The way in which men produce their means of subsistence depends first of all on the nature of the actual means they find in existence and have to reproduce.

Innovation distinguishes between a leader and a follower.

我感谢我的挣扎，因为没有它我就不会偶然发现我的力量。