Attic Nights, Vol. II

For they deny that the indications and sincere properties of any thing can be known and perceived, and they attempt to teach and show this very thing in many ways. Regarding this matter, Favorinus also composed ten books most subtly and acutely, which he titled Pyrrōneion tropōn Pyrrhonian Modes.

However, it is an old question, and one treated by many Greek writers, as to whether and to what extent it matters between the Pyrrhonian and Academic philosophers. For both are called skeptikoi skeptics, ephektikoi those who hold back judgment, and aporētikoi those who doubt, since both assert nothing and think nothing can be grasped. But they say that visions occur from all things, which they call phantasiai appearances/impressions, not as the nature of the things themselves is, but as the affection of the mind or body is of those to whom those visions come. Therefore, they say that all things whatsoever that move the senses of men are tōn pros ti relative things/things in relation to something else. That word signifies that there is nothing at all that consists by itself, nor that has its own proper force and nature, but that all things are referred to something else and seem such as the nature of their appearance is while they are being viewed, and such as they are created at our senses, to which they have arrived, not in themselves, from where they have departed. While the Pyrrhonians and Academics say these things similarly, they differ between themselves for other reasons...