The following are the most important of the passages referred to:—“Since I entered upon these philosophical inquiries, Varro has given me notice of a valuable and honourable dedication of a work of his to me.... In the mean time I have been preparing myself as he desired to make him a return.
αὐτῷ τῷ μέτρῳ καὶ λῶιον αἴκε δύνωμαι.
“I may as well, therefore, remove from my Academical Disputations the present speakers, who are distinguished characters indeed, but by no means philosophical, and who discourse with too much subtlety, and substitute Varro in their place. For these are the opinions of Antiochus, to which he is much attached. I can find a place for Catulus and Lucullus elsewhere.”—Ep. 12.
“The Catulus and Lucullus I imagine you have had before; but I have made new introductions to these books which I wish you to have, containing an eulogium upon each of these persons, and there are some other additions.”—Ep. 32.
“In consequence of the letter which you wrote to me about Varro, I have taken the Academy entirely out of the hands of those distinguished persons, and transferred it to our friend. And from two books I have made it into four. These are longer than the others were, though there are several parts left out.... In truth, if my self-love does not deceive me, these books have come out in such a manner that there is nothing of the same kind like them even in Greek.”—Ep. 13.
“I have transferred the whole of that Academical Treatise to Varro. It had at first been divided among Catulus, Lucullus, and Hortensius. Afterwards, as this appeared unsuitable, owing to those persons being, not indeed unlearned, but notoriously unversed in such subjects, as soon as I got home I transferred those dialogues to Cato and Brutus. Your letter about Varro has just reached me, and there is no one by whom the opinions of Antiochus could be more fitly supported.”—Ep. 16.
“I had determined to include no living persons in my dialogues; but since you inform me that Varro is desirous of it, and sets a great value upon it, I have composed this work, and completed the whole Academical Discussion in four books; I know not how well, but with such care that nothing can exceed it. In these, what had been excellently collected by Antiochus against the doctrine of incomprehensibility, I have attributed to Varro; to this I reply in my own person, and you are the third in our conversation. If I had made Cotta and Varro disputing with one another, as you suggest in your last letter, my own would have been a mute character....
“The Academics, as you know, I had discussed in the persons of Catulus, Lucullus, and Hortensius; but in truth the subject did not suit their characters, being more logical than what they could be supposed ever to have dreamt of. Therefore, when I read your letter to Varro, I seized on it as a sort of inspiration. Nothing could be more adapted to that species of philosophy in which he seems to take particular delight; or to the support of such a part that I could manage to avoid making my own sentiments predominant. For the opinions of Antiochus are extremely persuasive, and are so carefully expressed as to retain the acuteness of Antiochus with my own brilliancy of language, if indeed I possess any.”—Ep. 19.
The Antiochus mentioned above was a native of Ascalon, and the founder of the fifth Academy; he had been the teacher of Cicero while he studied at Athens; and he had also a school in Syria and another in Alexandria. Cicero constantly speaks of him with great regard and esteem. The leaders of the Academy since the time of Plato, (and Cicero ranks even him among those philosophers who denied the certainty of any kind of knowledge,) had gradually fallen into a degree of scepticism that seemed to strike at the root of all truth, theoretical and practical. But Antiochus professed to revive the doctrines of the old Academy, maintaining, in opposition to Carneades and Philo, that the intellect had in itself a test by which it could distinguish between what was real and what existed only in the imagination. He himself appears to have held doctrines very nearly coinciding with those of Aristotle; agreeing however so far with the Stoics as to insist that all emotions ought to be suppressed. So that Cicero almost inclines to class him among the Stoics; though it appears that he considered himself as an Eclectic philosopher, uniting the doctrines of the Stoics and Academics so as to revive the old Academy.
Marcus Terentius Varro was ten years older than Cicero, and a man of the most extensive and profound learning. He had held a naval command against the pirates, and against Mithridates, and served as lieutenant to Pompey in Spain, at the beginning of the civil war, adhering to his party till after the battle of Pharsalia, when he was pardoned, and taken into favour by Cæsar. He was proscribed by the second triumvirate, but escaped, and died b.c. 28. He was a very voluminous author, and according to his own account composed four hundred and ninety books; but only one, the three books De Re Rusticâ, have come down to us, and a portion of a large treatise De Linguâ Latinâ.