Nothing has more retarded the advancement of learning than the disposition of vulgar minds to ridicule and vilify what they cannot comprehend.

Curiosity is one of the permanent and certain characteristics of a vigorous intellect.

What I learned from being in France was learning to be better satisfied with my own country

Knowledge is of two kinds. We know a subject ourselves, or we know where we can find information on it

Don't learn to do, but learn in doing.

I don't smoke marijuana anymore. I don't drink. Marijuana is a handicap. So is alcohol. Alcohol is a terrible handicap. But in spite of being a handicap, it shouldn't be criminal.