For many parts of Nature can neither be invented with sufficient subtlety, nor demonstrated with sufficient perspicuity, nor accommodated unto use with sufficient dexterity, without the aid and intervening of the mathematics, of which sort are perspective, music, astronomy, cosmography, architecture, engineery, and divers others.
The first requisite of style, not only in rhetoric, but in all compositions, is perspicuity.
To write a genuine familiar or truly English style is to write as anyone would speak in common conversation, who had a thorough command and choice of words, or who could discourse with ease, force, and perspicuity, setting aside all pedantic and oratorical flourishes.
Memory depends very much on the perspicuity, regularity, and order of our thoughts. Many complain of the want of memory, when the defect is in the judgment; and others, by grasping at all, retain nothing.