“The best men of the best epochs are simply those who make the fewest blunders and commit the fewest sins.”
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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.
Science has fulfilled her function when she has ascertained and enunciated truth.
The man of science has learned to believe in justification, not by faith, but by verification.
The struggle for existence holds as much in the intellectual as in the physical world. A theory is a species of thinking, and its right to exist is coextensive with its power of resisting extinction by its rivals.