写作需要一颗心。没有激情，我什么都不是。

最好的书是让你感到不再孤独的书。

The great challenge of the modern world is to create institutions that are strong enough to govern effectively but also accountable and responsive to the needs of citizens.

纯数学在某种程度上是逻辑思想的诗歌。

Every ton of coal we extract carries a responsibility—to our workers, communities, and the planet.