"The fittest survive. What is meant by the fittest? Not the strongest; not the cleverest - weakness and stupidity everywhere survive. There is no way of determining fitness except in that a thing does survive. 'Fitness,' then, is only another name for 'survival.' Darwinism: That survivors survive."

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The office of science is not to record possibilities; but to ascertain what nature does ... As far as Darwinism deals with mere arguments of possibilities or even probabilities, without a basis of fact, it departs from the true scientific method and injures science, as most of the devotees of the new ism have already done.

— Louis Agassiz