Marxian Socialism must always remain a portent to the historians of Opinion — how a doctrine so illogical and so dull can have exercised so powerful and enduring an influence over the minds of men， and， through them， the events of history.

My art is a reflection of my inner world, not the outside one.

The real problem is not whether machines think but whether men do.

In the world of physics, we often find that the simplest questions are the hardest to answer.

善于教导的人必须遇到善于学习的人，才能使教育的效果更大。

人类注定是自由的。

预言是人类唯一一项无法经由练习而改善的技术。

The road to hell is paved with works-in-progress.

希望在任何困难中都能找到。