Argument of Gorgias.

If not‑being is not‑being, not‑being is not less than being, since not‑being is not‑being and being is being, for which reason, things no more exist than they do not exist.

If, however, not‑being exist, being will not exist, for it is the contrary of not‑being. If not‑being exist, it cannot be but that being does not exist; so that thus also nothing would exist, unless being and not‑being be the same. And if really these be the same, thus also nothing will exist, for not‑being does not exist, and so does not also being, since it is held to be the same as not‑being.