(1.)[436] When saying that eternity and time differ, that eternity refers to perpetual existence, and time to what "becomes" (this visible world), we are speaking off-hand, spontaneously, intuitionally, and common language supports these forms of expression. When however we try to define our conceptions thereof in greater detail, we become embarrassed; the different opinions of ancient philosophers, and often even the same opinions, are interpreted differently. We however shall limit ourselves to an examination of these opinions, and we believe that we can fulfil our task of answering all questions by explaining the teachings of the ancient philosophers, without starting any minute disquisition of our own. We do indeed insist that some of these ancient philosophers, these blessed men[437] have achieved the truth. It remains only to decide which of them have done so, and how we ourselves can grasp their thought. ETERNITY IS THE MODEL OF ITS IMAGE, TIME. First, we have to examine that of which eternity consists, according to those who consider it as different from time; for, by gaining a conception of the model (eternity), we shall more clearly understand its image called time.[438] If then, before observing eternity, we form a conception of time, we may, by reminiscence, from here below, rise to the contemplation of the model to which time, as its image, resembles. RELATION BETWEEN THE AEON AND INTELLIGIBLE BEING. 1. (2). How shall we define the aeon (or, eternity)? Shall we say that it is the intelligible "being" (or, nature) itself, just as we might say that time is the heaven and the universe, as has been done, it seems, by certain (Pythagorean) philosophers?[439] Indeed, as we conceive and judge that the aeon (eternity) is something very venerable, we assert the same of intelligible "being," and yet it is not easy to decide which of the two should occupy the first rank; as, on the other hand, the principle which is superior to them (the One) could not be thus described, it would seem that we would have the right to identify intelligible "being" (or, nature), and the aeon (or, eternity), so much the more as the intelligible world and the aeon (age, or eternity), comprise the same things. Nevertheless, were we to place one of these principles within the other, we would posit intelligible nature ("being") within the aeon (age, or eternity). Likewise, when we say that an intelligible entity is eternal, as (Plato) does:[346] "the nature of the model is eternal," we are thereby implying that the aeon (age or eternity) is something distinct from intelligible nature ("being"), though referring thereto, as attribute or presence. The mere fact that both the aeon (eternity) and intelligible nature ("being"), are both venerable does not imply their identity; the venerableness of the one may be no more than derivative from that of the other. The argument that both comprise the same