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

For if it is without magnitude, incorporeal, [and immoveable, it is impartible. For every thing][294] which in any way whatever is partible, is either partible on account of magnitude, or multitude, or on account of energies which are borne along with the flux of time. But intellect is eternal according to all things, and is beyond bodies, and the multitude which is in it is united. It is, therefore, impartible. That intellect also is incorporeal, is manifest from its conversion to itself. For no body is converted to itself. But that it is eternal, the identity of its energy with its essence evinces. For this has been before demonstrated. And that the multitude in it is united is evident from the continuity of intellectual multitude with the divine unities. For these are the first multitude; but intellects are next to these. Hence, though every intellect is a multitude, yet it is an united multitude. For prior to that which is divided, that which is collected into profound union, and is nearer to the one, subsists.