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

The thief and the murderer follow nature just as much as the philanthropist.

There is no greater mistake than the hasty conclusion that opinions are worthless because they are badly argued.

Fact I know; and Law I know; but what is this Necessity, save an empty shadow of my own mind's throwing?

Unity of plan everywhere lies hidden under the mask: of diversity of structure-the complex is everywhere evolved out of the simple.

The method of scientific investigation is nothing but the expression of the necessary mode of working of the human mind.

The birth of science was the death of superstition.