In science, as in art, and, as I believe, in every other sphere of human activity, there may be wisdom in a multitude of counsellors, but it is only in one or two of them.

Science is simply common sense at its best, that is, rigidly accurate in observation, and merciless to fallacy in logic.

The best men of the best epochs are simply those who make the fewest blunders and commit the fewest sins.

My business is to teach my aspirations to confirm themselves to fact, not to try and make facts harmonize with my aspirations.

It is because the body is a machine that education is possible. Education is the formation of habits, a superinducing of an artificial organization upon the natural organization of the body.

Proclaim human equality as loudly as you like, Witless will serve his brother.

My experience of the world is that things left to themselves don't get right.

The improver of natural knowledge absolutely refuses to acknowledge authority, as such. For him, skepticism is the highest of duties blind faith the one unpardonable sin.

The man of science has learned to believe in justification, not by faith, but by verification.

The results of political changes are hardly ever those which their friends hope or their foes fear.