Sextus Empiricus Pyrrhoniae Hypotyposes 3.28.258

[258] Nor, in fact, in so far as it is something else. For the existent has not anything else which is non-existent attached to it, so that if the existent in so far as it is existent is not taught, neither will it be taught in so far as it is something else; for whatsoever thing is attached to it is existent. And further, whether the existent thing which, they will say, is taught be apparent or non-evident, as it is subject to the absurdities we have stated, it will be incapable of being taught. But if neither the existent nor the non-existent is taught, there is nothing that is taught.