Psychology is a science, and teaching is an art; and sciences never generate arts directly out of themselves.

The mining industry is cyclical, but great companies are built by those who can navigate the downturns as well as the booms.

理智是不朽的，其他一切都是有限的。

写作是理解过去的一种方式。

文明被描述为对一系列挑战的回应结果，而其中最大的挑战始终是气候。