Thus we have marked off what belongs to the Couplement from what stands by itself: the one group has the character of body and never exists apart from body, while all that has no need of body for its manifestation belongs peculiarly to Soul: and the Understanding, as passing judgement upon Sense-Impressions, is at the point of the vision of Ideal-Forms, seeing them as it were with an answering sensation (i.e, with consciousness) this last is at any rate true of the Understanding in the Veritable Soul. For Understanding, the true, is the Act of the Intellections: in many of its manifestations it is the assimilation and reconciliation of the outer to the inner. Enneads I,1,
But the case is different when one holds that body is, of itself, perishable and that Soul is the principle of permanence: this view obliges us to the proof that the character of body is not in itself fatal either to the coherence or to the lasting stability which are imperative: it must be shown that the two elements of the union envisaged are not inevitably hostile, but that on the contrary [in the heavens] even Matter must conduce to the scheme of the standing result. Enneads: II I