真正的进步既要衡量经济增长，也要衡量生态系统的健康。

"The true mystery of the world is the visible, not the invisible."

The tears of the world are a constant quantity. For each one who begins to weep, somewhere else another stops. The same is true of the laugh.

我不会为任何人游泳。我是为自己游泳。

Mathematics is not just about numbers, equations, computations, or algorithms: it is about understanding.

"I am drawn to the lyric, the short poem, where every word has to be exact."