Enneads VI.4: The One Identical Essence is Everywhere Entirely Present
The Different Kinds of Presences
Is the intelligible (Being) then so varied and manifold? It is indeed varied, but it is simultaneously simple; it is both one and manifold; for reason (which is the essence of the universal Soul), is both one and manifold. The universal (Being) is also one; though any difference in it (in this sense, that it contains different essences), results from its own constitution; the difference inheres in its nature, for it could not belong to non-being. The constitution of Essence is such as to be inseparable from unity; unity is present wherever essence is, and the one Essence subsists in itself. It is indeed possible that an essence which in a certain respect is separated from another essence, is, however, entirely present with it. But there are different kinds of presence; first, when sense-things are present with intelligible things, at least to those to which they can be present; second, when intelligible entities are present to each other; likewise, when the body is present to the soul; another, when a science is present to the soul; further, when a science is present to another science, and both coexist in the same intelligence; last, when a body is present to another body.