16.

Among those, again, who say that our supreme and only good is to enjoy God, by whom both we ourselves and all things were made, the most eminent have been the Platonists, who not unreasonably judged it to belong to their duty to confute the Stoics and Epicureans--the latter especially, and almost exclusively. The Academic School is identical with the Platonists, as is shown plainly enough by the links of unbroken succession connecting the schools. For if you ask who was the predecessor of Arcesilas, the first who, announcing no doctrine of his own, set himself to the one work of refuting the Stoics and Epicureans, you will find that it was Polemo; ask who preceded Polemo, it was Xenocrates; but Xenocrates was Plato's disciple, and by him appointed his successor in the academy. Wherefore, as to this question concerning the supreme good, if we set aside the representatives of conflicting views, and consider the abstract question, you find at once that two errors confront each other as diametrically opposed--the one declaring the body, and the other declaring the mind to be the seat of the supreme good of men. You find also that truly enlightened reason, by which God is perceived to be our supreme good, is opposed to both of these errors, but does not impart the knowledge of what is true until it has first made men unlearn what is false. If now you consider the question in connection with the advocates of different views, you will find the Epicureans and Stoics most keenly contending with each other, and the Platonists, on the other hand, endeavouring to decide the controversy between them, concealing the truth which they held, and devoting themselves only to prove and overthrow the vain confidence with which the others adhered to error.