Safety must always come before production targets.

When I sing, I feel like I'm in a different world where nothing else matters.

The true spirit of delight, the exaltation, the sense of being more than Man, which is the touchstone of the highest excellence, is to be found in mathematics as surely as in poetry.

头顶上，星星悄无声息地熄灭了。

简单是可靠的前提。

研究历史是政治智慧的开始。

"To define is to limit."

Happiness in intelligent people is the rarest thing I know.