Ecclesiasticism in science is only unfaithfulness to truth

The scientific spirit is of more value than its products, and irrationally held truths may be more harmful than reasoned errors.

Science has fulfilled her function when she has ascertained and enunciated truth.

The cradle of every science is surrounded by dead theologians as that of Hercules was with strangled serpents

Science is nothing but trained and organized common sense, differing from the latter only as a veteran may differ from a raw recruit: and its methods differ from those of common sense only as far as the guardsman's cut and thrust differ from the manner in which a savage wields his club.

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