Page:The academic questions, treatise de finibus, and Tusculan disputations.djvu/107

 some are to be adopted, others impeached, because they are contrary to the first. What then do you think of this conclusion,—“If you say that the sun shines, and if you speak truth, therefore the sun does shine?” At all events you approve of the kind of argument, and you say that the conclusion has been most correctly inferred. Therefore, in teaching, you deliver that as the first mood in which to draw conclusions. Either, therefore, you will approve of every other conclusion in the same mood, or that art of yours is good for nothing. Consider, then, whether you are inclined to approve of this conclusion;—“If you say that you are a liar, and speak the truth, then you are a liar. But you do say that you are a liar, and you do speak the truth, therefore you are a liar.” How can you avoid approving of this conclusion, when you approved of the previous one of the same kind?

These are the arguments of Chrysippus, which even he himself did not refute. For what could he do with such a conclusion as this,—“If it shines, it shines: but it does shine, therefore it does shine?” He must give in; for the principle of the connexion compels you to grant the last proposition after you have once granted the first. And in what does this conclusion differ from the other,—“If you lie, you lie; but you do lie, therefore you do lie?” You assert that it is impossible for you either to approve or disapprove of this: if so, how can you any more approve or disapprove of the other? If the art, or the principle, or the method, or the force of the one conclusion avails, they exist in exactly the same degree in both.

This, however, is their last resource. They demand that one should make an exception with regard to these points which are inexplicable. I give my vote for their going to some tribune of the people; for they shall never obtain this exception from me. In truth, when they cannot prevail on Epicurus, who despises and ridicules the whole science of dialectics, to grant this proposition to be true, which we may express thus—“Hermachus will either be alive to-morrow or he will not;” when the dialecticians lay it down that every disjunctive proposition, such as “either yes or no” is not only true but necessary; you may see how cautious he is, whom they think slow. For, says he, if I should grant that