Language is only the instrument of science, and words are but the signs of ideas.

The labor of rising from the ground will be great, ... but as we mount higher, the earth's attraction, and the body's gravity, will be gradually diminished till we arrive at a region where the man will float in the air without any tendency to fall.

Every other enjoyment malice may destroy; every other panegyric envy may withhold; but no human power can deprive the boaster of his own encomiums.

Curiosity, like all other desires, produces pain as well as pleasure.

If a man does not make new acquaintances as he advances through life, he will soon find himself left alone. A man, sir, should keep his friendship in a constant repair.

In traveling, a man must carry knowledge with him, if he would bring home knowledge.

If a man has a science to learn he must regularly and resolutely advance.