Sextus Empiricus Pyrrhoniae Hypotyposes 2.13.168

[168] And it is certainly not apparent; for it would not need to be disclosed by means of the premisses if it were perceptible of itself and no less apparent than its premisses. But if it is non-evident, then, since there is an unsettled dispute concerning things non-evident, as we mentioned above, ¹ and they are in consequence non-apprehensible, the conclusion also of the argument said to be true will be non- apprehensible. And if this is non-apprehensible, we shall not know whether the deduction is true or false. Thus we shall be in ignorance as to whether the argument is true or false, and the ‟true” argument will be indiscoverable.