在追求真理的过程中，我们必须准备好放弃那些与实验相矛盾的最珍视的信念。

物理学的美丽在于它能够用简单的方式解释复杂的事物。

Every mental act has its place in the economy of life.

The best leaders are those who can turn vision into reality.

In every person, there is an abyss. Sometimes you look into it, and sometimes you don’t.

The peculiar evil of silencing the expression of an opinion is that it is robbing the human race； posterity as well as the existing generation； those who dissent from the opinion， still more than those who hold it.