[80] and leaving the logical part of philosophy, as in no respect necessary for the acquisition of virtue, to the word-catchers, and the natural part, as being too sublime for human nature to master, to those who love to converse about high objects (except indeed so far as such a study takes in the contemplation of the existence of God and of the creation of the universe), they devote all their attention to the moral part of philosophy, using as instructors the laws of their country which it would have been impossible for the human mind to devise without divine inspiration.