Sextus Empiricus Pyrrhoniae Hypotyposes 3.7.41

[41] If, then, one should affirm the existence of a surface or a line, then it will be affirmed that each of the afore-mentioned objects either can subsist of itself or is cognized solely in connexion with so-called Bodies. But to imagine either a line or a surface as existing of itself is doubtless silly. While if it should be said that each of these objects is cognized solely in connexion with the Bodies and has no independent existence, it will thereby be granted, in the first place, that the Bodies are not generated from them (for if so, I suppose, these objects ought to have had independent existence first, and then have combined to form the Bodies);