Sextus Empiricus Pyrrhoniae Hypotyposes 2.20.221

[221] Then, in the next place, all the species will be said to partake either of the same part of their genus or of different parts; but to partake of the same part is impossible for the reasons stated above; while if they partake of different parts, the species will be generically dissimilar one to another (which they will not admit), and each genus will be infinite because cut up into infinite sections (not into the species only but also into the particulars, since it is actually seen in these along with its species; for Dion ¹ is said to be an animal as well as a man). But if these consequences are absurd, then not even by way of parts do the species partake of their genus, it being a unity.