2. (3). What then is that thing by virtue of which the intelligible world is eternal and perpetual? Of what does perpetuity consist? Either perpetuity and eternity are identical, or eternity is related to perpetuity. Evidently, however, eternity consists in an unity, but in an unity formed by multiple elements, in a conception of nature derived from intelligible entities, or which is united to them, or is perceived in them, so that all these intelligible entities form an unity, though this unity be at the same time manifold in nature and powers. Thus contemplating the manifold power of the intelligible world, we call "being" its substrate; movement its life; rest its permanence; difference the manifoldness of its principles; and identity, their unity.[441] Synthesizing these principles, they fuse into one single life, suppressing their difference, considering the inexhaustible duration, the identity and immutability of their action, of their life and thought, for which there is neither change nor interval. The contemplation of all these entities constitutes the contemplation of eternity; and we see a life that is permanent in its identity, which ever possesses all present things, which does not contain them successively, but simultaneously; whose manner of existence is not different at various times, but whose perfection is consummate and indivisible. It therefore contains all things at the same time, as in a single point, without any of them draining off; it resides in identity, that is, within itself, undergoing no change. Ever being in the present, because it never lost anything, and will never acquire anything, it is always what it is. Eternity is not intelligible existence; it is the (light) that radiates from this existence, whose identity completely excludes the future and admits nothing but present existence, which remains what it is, and does not change. THE LIFE OF THE INTELLIGENCE IS EVER CONTEMPORANEOUS. What that it does not already possess could (intelligible existence) possess later? What could it be in the future, that it is not now? There is nothing that could be added to or subtracted from its present state; for it was not different from what it is now; and it is not to possess anything that it does not necessarily possess now, so that one could never say of it, "it was"; for what did it have that it does not now have? Nor could it be said of it, "it will be"; for what could it acquire? It must therefore remain what it is. (As Plato thought[438]), that possesses eternity of which one cannot say either "it was," or "will be," but only, "it is;" that whose existence is immutable, because the past did not make it lose anything, and because the future will not make it acquire anything. Therefore, on examining the existence of intelligible nature, we see that its life is simultaneously entire, complete, and without any kind of an interval. That is the eternity we seek.