The Ens of Parmenides thus coincided mainly with that which (since Kant) has been called the Noumenon--the Thing in itself--the Absolute; or rather with that which, by a frequent illusion, passes for the absolute--no notice being taken of the cogitant and believing apart from mind, as if cogitation and belief, _cogitata_ and _credita_, would be had without it. By Ens was understood the remnant in his mind, after leaving out all that abstraction, as far as it had then been carried, could leave out. It was the minimum indispensable to the continuance of thought; you cannot think (Parmenides says) without thinking of Something, and that Something Extended and Enduring. Though he and others talk of this Something as an Absolute (_i.e._ apart from or independent of his own thinking mind), yet he also uses some juster language ([Greek: to\ ga\r au)to\ noei=n e)/stin te kai\ ei)=nai]), showing that it is really relative: that if the Cogitans implies a Cogitatum, the Cogitatum also implies no less its correlative Cogitans: and that though we may divide the two in words, we cannot divide them in fact. It is to be remarked that Parmenides distinguishes the Enduring or Continuous from the Transient or Successive, Duration from Succession (both of which are included in the meaning of the word Time), and that he considers Duration alone as belonging to Ens or the Absolute--to the region of Truth--setting it in opposition or antithesis to Succession, which he treats as relative and phenomenal. We have thus (with the Eleates) the first appearance of Ontology, the science of Being or Ens, in Grecian philosophy. Ens is everything, and everything is Ens. In the view of Parmenides, Ontology is not merely narrow, but incapable of enlargement or application; we shall find Plato and others trying to expand it into numerous imposing generalities.[67] [Footnote 67: Leibnitz says, Réponse à M. Foucher, p. 117, ed. Erdmann, "Comment seroit il possible qu'aucune chose existât, si l'être même, ipsum Esse, n'avoit l'existence? Mais bien au contraire ne pourrait on pas dire avec beaucoup plus de raison, qu'il n'y a que lui qui existe véritablement, les êtres particuliers n'ayant rien de permanent? Semper generantur, et nunquam sunt."] [Side-note: Parmenidean phenomenology--relative and variable.]