In its character as Life, as emanation, as containing all things in their precise forms… it must of necessity derive from some other Being, from one that does not emanate but is the Principle of Emanation, of Life, of Intellect and of the Universe.
Plotinus establishes emanation as the defining ontological character of the Intellectual-Principle, which must itself derive from a prior and simpler Source that is the very Principle of all emanation.
, The Six Enneads, 270thesis