ETERNITY IS SEMPITERNAL EXISTENCE.
5. (6). As this nature that is eternal and radiant with beauty refers to the One, issues from Him, and returns to Him, as it never swerves from Him, ever dwelling around Him and in Him, and lives according to Him, Plato was quite right[438] in saying not casually, but with great profundity of thought, that "eternity is immutable in unity." Thereby Plato not only reduces the eternity to the unity that it is in itself, but also relates the life of existence to the One itself. This life is what we seek; its permanence is eternity. Indeed that which remains in that manner, and which remains the same thing, that is, the actualization of that life which remains turned towards, and united with the One, that whose existence and life are not deceptive, that truly is eternity. (For intelligible or) true existence is to have no time when it does not exist, no time when it exists in a different manner; it is therefore to exist in an immutable manner without any diversity, without being first in one, and then in another state. To conceive of (existence), therefore, we must neither imagine intervals in its existence, nor suppose that it develops or acquires, nor believe that it contains any succession; consequently we could neither distinguish within it, or assert within it either before or after. If it contain neither "before" nor "after," if the truest thing that can be affirmed of it be that it is, if it exist as "being" and life, here again is eternity revealed. When we say that existence exists always, and that there is not one time in which it is, and another in which it is not, we speak thus only for the sake of greater clearness; for when we use the word "always," we do not take it in an absolute sense; but if we use it to show that existence is incorruptible, it might well mislead the mind in leading it to issue out from the unity (characteristic of eternity) to make it run through the manifold (which is foreign to eternity). "Always" further indicates that existence is never defective. It might perhaps be better to say simply "existence." But though the word "existence" suffices to designate "being," as several philosophers have confused "being" with generation, it was necessary to clear up the meaning of existence by adding the term "always." Indeed, though we are referring only to one and the same thing by "existence" and "existing always," just as when we say "philosopher," and "the true philosopher," nevertheless, as there are false philosophers, it has been necessary to add to the term "philosophers" the adjective "true." Likewise, it has been necessary to add the term "always" to that of "existing," and that of "existing" to that of "always;" that is the derivation of the expression "existing always," and consequently (by contraction), "aion," or, eternity. Therefore the idea "always" must be united to that of "existing," so as to designate the "real being."