These “virtues” are of two sorts, “natural,” and “acquired.” By natural, I mean not that which a man hath from his birth: for that is nothing else but sense; wherein men differ so little one from another, and from brute beasts, as it is not to be reckoned amongst virtues. But I mean that “wit” which is gotten by use only and experience; without method, culture, or instruction. This “natural wit” consisteth principally in two things, “celerity of imagining,” that is, swift succession of one thought to another, and steady direction to some approved end. On the contrary, a slow imagination maketh that defect, or fault of the mind which is commonly called “dullness,” “stupidity,” and sometimes by other names that signify slowness of motion, or difficulty to be moved.