If we were motivated by money, we would have sold the company a long time ago and ended up on a beach.

Just the discipline of having to put your thoughts in order with somebody else is very useful thing.

数学是为不同事物赋予相同名称的艺术。

Tyranny will fall, freedom will endure.

度过生活的唯一方法是笑着度过。你要么笑，要么哭。我更喜欢笑。哭让我头疼。

物理定律必须以独立于坐标系选择的方式表述。