The separation of law and morals is a necessary feature of a legal system.

学习数学的最好方法就是做数学。

I don't let anyone else define my worth.

The more you know, the more you realize you don't know.

"I don't want to be a hero. I just want to be a person who does the right thing."

The present state of the system of nature is evidently a consequence of what it was in the preceding moment, and if we conceive of an intelligence which at a given instant comprehends all the relations of the entities of this universe, it could state the respective positions, motions, and general effects of all these entities at any time in the past or future.