When I was a boy of fourteen, my father was so ignorant I could hardly stand to have the old man around. But when I got to be twenty-one, I was astonished at how much the old man had learned in seven years.

All you need in this life is ignorance and confidence; then success is sure.

There is something worse than ignorance, and that's knowing what ain't so.

Many will think they may reasonably blame me by alleging that my proofs are opposed to the authority of certain men held in the highest reverence by their inexperienced judgments; not considering that my works are the issue of pure and simple experience, who is the one true mistress. These rules are sufficient to enable you to know the true from the false— and this aids men to look only for things that are possible and with due moderation— and not to wrap yourself in ignorance, a thing which can have no good result, so that in despair you would give yourself up to melancholy.