Everything has something of the Good, by virtue of possessing a certain DEGREE OF UNITY and a certain degree of Existence and by participation in Ideal-Form: to the extent of the Unity, Being, and Form which are present, there is a sharing in an image, for the Unity and Existence in which there is participation are no more than images of the Ideal-Form. Enneads I,7,
All that is not One is conserved by virtue of the One, and from the One derives its characteristic nature: if it had not attained such unity as is consistent with being made up of multiplicity we could not affirm its existence: if we are able to affirm the nature of single things, this is in virtue of the unity, the identity even, which each of them possesses. But the all-transcendent, utterly void of multiplicity, has no mere unity of participation but is unity’s self, independent of all else, as being that from which, by whatever means, all the rest take their DEGREE OF UNITY in their standing, near or far, towards it. Enneads V,3,
It would appear, then, that the unity of a particular is related not so much to Being as to a standard of perfection: in so far as the particular attains perfection, so far it is a unity; and the DEGREE OF UNITY depends on this attainment. The particular aspires not simply to Being, but to Being-in-perfection: it is in this strain towards their perfection that such beings as do not possess unity strive their utmost to achieve it. Enneads VI,2,