Sextus Empiricus Pyrrhoniae Hypotyposes 2.20.227

[227] And further, here is another point worthy of notice. Just as, because Alexander and Paris ¹ are identical, it is impossible that the statement ‟Alexander walks” should be true when ‟Paris walks” is false, so also if ‟manhood” is identical for both Theon and Dion, the term ‟man” when introduced as an element in a judgement will cause the judgement to be equally true or false in the case of both. But this is not what we find; for when Dion is sitting and Theon walking, the judgement ‟man walks” is true when used of the one, but false of the other. Therefore the term ² ‟man” is not common to them both and the same for both but, if applicable at all, it is peculiar to one of the two.