Plutarch, De communibus notitiis adversus Stoicos
Goodwin, Ed.

I pass by many absurdities of theirs, touching only such as are against sense. The dispute concerning increase is indeed ancient; for the question, as Chrysippus says, was put by Epicharmus. Now, whereas those of the Academy think that the doubt is not very easy and ready all of a sudden to be cleared, these men have mightily exclaimed against them, and accused them of taking away the presumptions, and yet themselves are so far from preserving the common notions, that they pervert even sense itself. For the discourse is simple, and these men grant the suppositions,—that all particular substances flow and are carried, some of them emitting forth somewhat from themselves, and others receiving things coming from elsewhere; and that the things to which there is made an accession or from which there is a decession by numbers and multitudes, do not remain the same, but become others by the said accessions, the substance receiving a change; and that these changes are not rightly called by custom increasings or diminutions, but it is fitter they should be styled generations and corruptions, because they drive by force from one state to another, whereas to increase and be diminished are passions of a body that is subject and permanent. These things being thus in a manner said and delivered, what would these defenders of evidence and canonical regulators of common conceptions have? Every one of us (they say) is double, twin-like, and composed of a double nature; not as the poets feigned of the Molionidae, that they in some parts grow together [p. 422] and in some parts are separated,—but every one of us has two bodies, having the same color, the same figure, the same weight and place. ... These things were never before seen by any man; but these men alone have discerned this composition, doubleness, and ambiguity, how every one of us is two subjects, the one substance, the other quality; and the one is in perpetual flux and motion, neither increasing nor being diminished nor remaining altogether; the other remains and increases and is diminished, and suffers all things contrary to the former, with which it is so concorporated, conjoined, and confounded, that it exhibits not any difference to be perceived by sense. Indeed, Lynceus is said to have penetrated stones and oaks with his sight; and a certain man sitting on a watch-tower in Sicily beheld the ships of the Carthaginians setting forth from their harbor, which was a day and a night's sail from thence. Callicrates and Myrmecides are said to have made chariots that might be covered with the wings of a fly, and to have engraved verses of Homer on a sesame seed. But none ever discerned or discovered this diversity in us; nor have we perceived ourselves to be double, in one part always flowing, and in the other remaining the same from our birth even to our death. But I make the discourse more simple, since they make four subjects in every one, or rather every one of us to be four. But two are sufficient to show their absurdity. For if, when we hear Pentheus in the tragedy affirm that he sees two suns and two cities of Thebes,¹ we say that he does not see, but that his sight is dazzled, he being transported and troubled in his mind; why do we not bid those farewell, who assert not one city alone, but all men and animals, and all trees, vessels, instruments, and clothes, to be double and composed of two, as men who constrain us to dote rather than to understand? But [p. 423] this feigning other natures of subjects must perhaps be pardoned them; for there appears no other invention by which they can maintain and uphold the augmentations of which they are so fond.