The Marriage of Philology and Mercury

...as even Caesar himself and Messalla Marcus Valerius Messalla Corvinus, a Roman general and author known for his grammatical works wrote entire volumes concerning individual letters. Following this is
LogicLogic, which is deservedly called the "Art of arts," the "Science of sciences," and the hand of philosophy original: "φιλοσοφίας χείρ". All the Philosophers and the leaders of the wise have approved of this upright discipline; provided, however, that there are no futile skirmishes and quarrels over "goat's wool" A Latin idiom meaning to argue over trifles or things of no value as they say. Nothing is more foreign to a truly Philosophical mind than these things, which—if I may use the wordplay of the most excellent men in this branch of learning—make leisure into idleness original: "σχολὴν... σχολὴν", and a scholarly discussion into a waste of time original: "διατριβὴν κατατριβὴν", and the categories themselves most worthy of accusations original: "κατηγορίας... κατηγοριῶν"; a pun on the dual meaning of the Greek term for logical classifications and legal charges.
RhetoricThe sister of this, so to speak, is Rhetoric, differing almost as much from the other as—as Zeno Zeno of Citium, founder of Stoicism used to argue—an open palm differs from a closed fist.