"The only way to deal with an unfree world is to become so absolutely free that your very existence is an act of rebellion."

He who wants to do good knocks at the gate； he who loves finds the gate open。

In quantum mechanics, we have to abandon the idea that particles have definite properties before measurement.

There are two freedoms - the false, where a man is free to do what he likes; the true, where he is free to do what he ought.