Happiness is beneficial for the body, but it is grief that develops the powers of the mind.

可持续性不是一种选择，而是我们对下一代的责任。

The purpose of abstraction is not to be vague, but to create a new semantic level in which one can be absolutely precise.

The final test of a novel is whether you care so much for the people that you want to know what happens to them next.

可持续性不是一种趋势，而是我们对后代的责任。