The worth of a psychological theory is measured by its usefulness.

The act of writing is an act of optimism. You would not take the trouble to do it if you felt it didn't matter.

The best way to lead is by example.

如果我们想保护海洋生物多样性，可持续的捕捞方式不是一种选择，而是一种必要。

世界是一个舞台，每个人都是演员。