"The fundamental facts about the Greek was that he had to use his mind. The ancient priest had said, "Thus far and no farther. We set the limits of thought." The Greeks said, All things are to be examined and called into question. There are no limits set on thought."

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Nobody since Newton has been able to use geometrical methods to the same extent for the like purposes; and as we read the Principia we feel as when we are in an ancient armoury where the weapons are of gigantic size; and as we look at them we marvel what manner of man he was who could use as a weapon what we can scarcely lift as a burden.

— William Whewell