能够激发学生对一件善行或一首好诗的感受的教师，比那些用一排排自然物体填满我们记忆的人成就更大。

艺术家必须是不可见之物的仆人。

If you're changing the world, you're working on important things. You're excited to get up in the morning.

The best way to learn mathematics is to do mathematics.

邪恶胜利的唯一必要条件是好人无所作为。