The first step in liquidating a people is to erase its memory. Destroy its books, its culture, its history. Then have somebody write new books, manufacture a new culture, invent a new history. Before long the nation will begin to forget what it is and what it was. The world around it will forget even faster.

The utility of an idea determines its place in mental life.

A sustainable coal industry is possible if we commit to the right technologies.

幸福就是珍惜小事。

没有对人类的热爱，英雄是什么？

种树的最佳时间是25年前，第二好的时间是今天。