Mathematics is the poetry of logical ideas.

当儿童还没有发展起控制能力的时候，“让儿童想干什么就干什么”是与自由观念相违背的。

Thought is the servant of action, and action is the servant of survival.

You can't please everyone, so don't try.

I know not with what weapons World War III will be fought, but World War IV will be fought with sticks and stones。

The editor's job is to make the director's vision come to life.