To say nothing, then, of all these opinions, let us now examine those others which have been long and vigorously maintained. Some have accounted pleasure the chief good; the chief of whom was Aristippus, who had been a pupil of Socrates, and from whom the Cyrenaic school spring. After him came Epicurus, whose school is now better known, though he does not exactly agree with the Cyrenaics about pleasure itself. But Callipho thought that pleasure and honour combined made up the chief good. Hieronymus placed it in being free from all annoyance; Diodorus in this state when combined with honour. Both these last men were Peripatetics. To live honourably, enjoying those things which nature makes most dear to man, was the definition both of the Old Academy, (as we may learn from the writings of Polemo, who is highly approved of by Antiochus,) and of Aristotle, and it is the one to which his friends appear now to come nearest. Carneades also introduced a definition, (not because he approved of it himself, but for the sake of opposition to the Stoics,) that the chief good is to enjoy those things which nature has made man consider as most desirable. But Zeno laid it down that that honourableness which arises from conformity to nature is the chief good. And Zeno was the founder and chief of the Stoic school.
XLIII. This now is plain enough, that all these chief goods which I have mentioned have a chief evil corresponding to them, which is their exact opposite. I now put it to you, whom shall I follow? only do not let any one make me so ignorant and absurd a reply as, Any one, provided only that you follow some one or other. Nothing more inconsiderate can be said: I wish to follow the Stoics. Will Antiochus, (I do not say Aristotle, a man almost, in my opinion, unrivalled as a philosopher, but will Antiochus) give me leave? And he was called an Academic; but he would have been, with very little alteration, something very like a Stoic. The matter shall now be brought to a decision. For we must either give the wise man to the Stoics or to the Old Academy. He cannot belong to both; for the contention between them is not one about boundaries, but about the whole territory. For the whole system of life depends on the definition of the chief good; and those who differ on that point, differ about the whole system of life. It is impossible, therefore, that those of both these schools should be wise, since they differ so much from one another: but one of them only can be so. If it be the disciple of Polemo, then the Stoic is wrong, who assents to an error: and you say that nothing is so incompatible with the character of a wise man as that. But if the principles of Zeno be true, then we must say the same of the Old Academics and of the Peripatetics; and as I do not know which is the more wise of the two, I give my assent to neither. What? when Antiochus in some points disagrees with the Stoics whom he is so fond of, does he not show that these principles cannot be approved of by a wise man?