科学的进步不是一条直线，而是一个螺旋，总是在前进，又总是回到起点。

The world is what it is; men who are nothing, who allow themselves to become nothing, have no place in it.

The effects of education extend far beyond individual earnings.

The secret of theory is that truth does not exist.

Never stop learning; the world is always evolving.

We are stubborn on vision. We are flexible on details.

不要担心别人会做什么。预测未来的最好方法就是创造未来。