人类有一件真正有力的武器，那就是笑。
The human race has one really effective weapon, and that is laughter.
The best way to predict the future is to create it.
艺术不是关于美，而是关于真理。
A man's life is limited, but service to the people is infinite.
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.
The essence of mathematics lies in its freedom.
"The reason death sticks so closely to life isn't biological necessity—it's envy. Life is so beautiful that death has fallen in love with it, a jealous, possessive love that grabs at what it can."