Science knows no country, because knowledge belongs to humanity, and is the torch which illuminates the world.

The selfish gene theory is not a theory about selfishness in the everyday sense. It is a theory about the evolution of behavior.

你可以通过一个人的回答来判断他是否聪明。你可以通过一个人的问题来判断他是否明智。

Loneliness is the starting point of thought.

幸福不是没有问题，而是有能力处理它们。