I'm as proud of many of the things we haven't done as the things we have done.Innovation is saying no to a thousand things.

Small changes in incentives can lead to large changes in behavior.

心有自己的地理，自己的天气。

The joy of discovery is what drives mathematicians forward.

The human being cannot live in a condition of emptiness for very long: if he is not growing toward something, he does not merely stagnate; the pent-up potentialities turn into morbidity and despair, and eventually into destructive activities.

无无化。