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

For if it proceeds from itself, it will also make a conversion to itself. For to that from which progression is derived, to that a conversion co-ordinate to the progression is directed. For if it alone proceeded from itself, but having proceeded was not converted to itself, it would never aspire after its proper good, and that which it is able to impart to itself. Every cause however is able to impart to that which proceeds from it,[228] together with the essence which it gives, well-being conjoined with this essence. Hence that which is self-subsistent will impart this to itself. This therefore is the proper good to that which is self-subsistent. And hence this will not be the object of desire to that which is not[229] converted to itself. But not desiring this, it will not obtain it, and not obtaining it, it will be imperfect, and not sufficient to itself. If, however, self-sufficiency and perfection pertain to any thing, they must pertain to that which is self-subsistent. Hence it will obtain its proper good, and will be converted to itself.