问题是，我们是否乐于假设我们的孙子孙女可能永远无法在大象的图片书之外看到大象？

Contemplating the weaknesses of others is easy； contemplating the weaknesses in yourself is hard， but it pays a much higher reward.

A man's life is limited, but service to the people is infinite.

I always tell my students that it's okay to make mistakes, as long as you learn from them.

世界不是一个舞台，而是一个疯人院。演员不是表演者，而是囚犯。