Enneads VI.4: The One Identical Essence is Everywhere Entirely Present
The Image Is Bound to Its Model by Radiation
10. It may be objected that the image need not necessarily be attached to its model; for there are images that subsist in the absence of their model from which they are derived. For instance, when the fire ceases, the heat that proceeds from it does not any the less remain in the warmed object. The relation between this image and its model should be understood as follows. Let us consider an image made by a painter. In this case, it is not the model who made the image, but the painter; and even so it is not even the real image of the model, even if the painter had painted his own portrait; for this image did not arise from the body of the painter, nor from the represented form, nor from the painter himself, but it is the product of a complex of colors arranged in a certain manner. We, therefore, do not really here have the production of an image, such as is furnished by mirrors, waters, and shadows. Here the image really emanates from the pre-existing model, and is formed by it, and could not exist without it. It is in this manner that the inferior potentialities proceed from the superior ones.
SOULS ARE AS IMMORTAL AS THE ONE FROM WHOM THEY PROCEED.
Let us proceed to the objection drawn from the heat that remains after the withdrawal of the fire. The heat is not the image of the fire, or at least, we may deny that there is always fire in heat; but even so heat would not be independent of fire. Besides, when you withdraw from a body the fire that heats it, this body grows cold, if not instantaneously, at least gradually. It would, however, be wrong to say that the powers that descend here below also gradually grow extinct; for this would amount to stating that only the One is immortal, while the souls and intelligences are mortal. Besides, it is not reasonable to admit that even the things that derive from a "being" that wastes away also gradually exhaust themselves; for even if you should immobilize the sun, it would still shed the same light in the same places. If it were objected that it would not be the same light, the conclusion would be (the absurdity) that the body of the sun is in a perpetual wastage. Last we have elsewhere demonstrated at length that what proceeds from the One does not perish, but that all souls and intelligences are immortal.