4. As the Good must be simple, and self-sufficient, it has no need
to think. Now that which it does not need could not be within it,
since nothing (that is different from it) exists in it; consequently,
thought does not exist in it (because it is essentially simple[12]).
Besides, the Good is one thing, and Intelligence another; by thinking,
Intelligence takes on the form of Good. Besides, when in two objects
unity is joined to something other than itself, it is not possible that
this unity, which is joined to something else, should be Unity itself.
Unity in itself should exist in itself before this unity was joined
to anything else. For the same reason, unity joined to something else
presupposes absolutely simple Unity, which subsists in itself, and has
nothing of what is found in unity joined to other things. How could
one thing subsist in another if the principle, from which this other
thing is derived, did not have an existence that was independent, and
prior to the rest? What is simple cannot derive anything from any other
source; but what is manifold, or at least indicates plurality, is of
derivative (nature). The Good may be compared to light, Intelligence
to the sun, and the Soul to the moon that derives her light from the
sun. The Soul's intelligence is only borrowed, which intellectualizes
her by coloring her with its light. On the contrary, Intelligence,
in itself, possesses its own light; it is not only light, but it is
essentially luminous. The Principle that illuminates Intelligence and
which is nothing but light, is absolutely simple light, and supplies
Intelligence with the power to be what it is. How could it need
anything else? It is not similar to what exists in anything else;
for what subsists in itself is very different from what subsists in
something else.