There has to be a global mission of human progress.

You don't know what you don't know.

Nothing is so well learned as that which is discovered.

There is no learning without remembering.

Somebody does somethin' stupid, that's human. They don't stop when they see it's wrong, that's a fool.

I believe there exists, & I feel within me, an instinct for the truth, or knowledge or discovery, of something of the same nature as the instinct of virtue, & that our having such an instinct is reason enough for scientific researches without any practical results ever ensuing from them.