幸福是一种心态，而不是一系列环境。
Happiness is a state of mind, not a set of circumstances.
It is silly not to hope, he thought.
The economy of the future is one where growth is decoupled from the consumption of finite resources.
数学中最激动人心的时刻是当你意识到两个看似不相关的领域有着深刻的联系时。
科学不是神学的婢女；重点不是用科学证明宗教教条，而是理解世界的本来面目。