Plutarch, De Stoicorum repugnantiis
Goodwin, Ed.

As for disputing on both sides, he says, that he does not universally reject it, but exhorts us to use it with caution, as is done in pleadings, not with a design really to disprove, but to dissolve their probability. ‘For to those,’ says he, ‘who endeavor a suspension of assent concerning all things, it is convenient to do this, and it co-operates to what they desire; but as for those who would work and establish in us a certain science according to which we shall professedly live, they ought, on the contrary, to state the first principles, and to direct their novices who are entered from the beginning to the end; and where there is occasion to make mention of contrary discourses, to dissolve their probability, as is done in pleadings.’ For this he hath said in express words. Now that it is absurd for philosophers to think that they ought to set down the contrary opinion, not with all its reasons, but like pleaders, disabling it, as if they contended not for truth but victory, we have elsewhere spoken against him. But that he himself has, not here and there in his disputations, but frequently, confirmed the discourses which are contrary to his own opinions,—and that stoutly, and with so much earnestness and contention that it was not for every one to understand what he liked,—the Stoics themselves affirm, who admire the man's acuteness, and think that Carneades said nothing of his own, but that catching hold of those arguments which Chrysippus alleged for the contrary opinion, he assaulted with them his positions, and often cried out,

Wretch, thy own strength will thee undo,¹

as if Chrysippus had given great advantages against himself to those who would disturb and calumniate his doctrines.

[p. 435] But of those things which he has written against custom they are so proud and boasting, that they fear not to affirm, that all the sayings of all the Academics together, if they were collected into one body, are not comparable to what Chrysippus has writ in disparagement of the senses. Which is an evident sign of the ignorance or self-love of the speakers; but this indeed is true, that being afterwards desirous to defend custom and the senses, he was inferior to himself, and the latter treatise was much weaker than the former. So that he contradicts himself; for having always directed the proposing of an adversary's opinions not with approbation, but with a demonstration of their falsity, he has showed himself more acute in opposing than defending his own doctrines; and having admonished others to take heed of contrary arguments, as withdrawing comprehension, he has been more sedulous in framing such proofs as take away comprehension, than such as confirm it. And yet he plainly shows that he himself feared this, writing thus in his Fourth Book of Lives: ‘Repugnant arguments and probabilities on the contrary side are not rashly to be proposed, but with caution, lest the hearers distracted by them should let go their conceptions, not being able sufficiently to apprehend the solutions, but. so weakly that their comprehensions may easily be shaken. For even those who have, according to custom, preconceived both sensible objects and other things depending on the senses quickly forego them, being distracted by Megarian interrogatories and by others more numerous and forcible.’ I would willingly therefore ask the Stoics, whether they think these Megarian interrogatories to be more forcible than those which Chrysippus has written in six books against custom; or rather this should be asked of Chrysippus himself. For observe what he has written about the Megarian reason, in his book concerning the Use of Speech, thus: ‘Some such things fell out in the discourse [p. 436] of Stilpo and Menedemus; for, whereas they were renowned for wisdom, their disputing has turned to their reproach, their arguments being part clumsy, and the rest violently sophistical.’ And yet, good sir, you fear lest those arguments which you deride and term the disgrace of their proposers, as having a manifest faultiness, should divert some from comprehension. And did not you yourself, writing so many books against custom, in which you have added whatever you could invent, ambitiously striving to exceed Arcesilaus, expect that you should perplex some of your readers? For neither does he use slender arguments against custom; but as if he were pleading, he with some passion in himself stirs up the affections of others, telling his opponent that he talks foolishly and labors in vain. And that he may leave no room to deny his speaking of contradictions, he has in his Natural Positions written thus: ‘It may be lawful for those who comprehend a thing to argue on the contrary side, applying to it that defence which the matter itself affords; and sometimes, when they comprehend neither, to discourse what is alleged for either.’ And having said in his book concerning the Use of Speech, that we ought no more to use the force of reason than of arms for such things as are not fitting, he subjoins this: ‘For they are to be employed for the finding out of truths and for the alliance of them, and not for the contrary, though many men do it.’ By ‘many’ perhaps he means those who withhold their assent. But these philosophers, comprehending neither, argue on both sides, believing that, if any thing is comprehensible, thus only or chiefly does truth afford a comprehension of itself. But you, who accuse them, and do yourself write contrary to those things which you comprehend concerning custom, and exhort others with assurance to do the same, confess that you wantonly use the faculty of disputing, out of vain ambition, even on unprofitable and hurtful things.

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