The Six Books of Proclus on the Theology of Plato, Volume 2

Every soul is an essence vital and gnostic, and a life essential and gnostic, and is knowledge, essence, and life. All things likewise subsist in it at once, the essential, the vital, and the gnostic; and all things are in all, and each is separate from the rest.

For if it is the medium between impartible forms, and those which are divided about bodies, it is neither so impartible as all intellectual natures, nor so partible as corporeal forms. Since, therefore, essences, lives and cognitions are divided in corporeal natures, these subsist in souls impartibly, unitedly, and incorporeally, and all of them exist at once, through their immateriality and impartibility. Since, likewise, in intellectual natures, all things subsist according to union, they are distinguished and divided in souls. All things, therefore, subsist together in these, and at the same time apart. But if all impartibles subsist together and in one, they pervade through each other, and if they are separate, they are again divided without confusion; so that each subsists by itself, and all are in all. For in the essence of soul there is both life and knowledge;[313] since every soul would not know itself, if the essence of it was of itself deprived of life and knowledge. And in the life of the soul there are both essence and knowledge. For unessential[314] life, and which is without knowledge, pertains to material lives, which are neither able to know themselves, nor are genuine essences. Knowledge, also, which is unessential and without life, is without subsistence. For all knowledge belongs to that which is vital, and which is of itself allotted an essence.