Even dirt glitters when the sun is shining upon it

In all times it is only individuals that have advanced science, not the age.

Sameness leaves us in peace but it is contradiction that makes us productive.

First let a man teach himself, and then he will be taught by others.

A man doesn't learn to understand anything unless he loves it.

What we agree with leaves us inactive, but contradiction makes us productive.

A person hears only what they understand.