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

Proposition Xlix.

Project Gutenberg EPUB edition Proclus and Taylor, Thomas
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Every thing self-subsistent is perpetual.
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For there are two modes according to which it is necessary a thing should not be perpetual; the one arising from composition, and the other from a subsistence in something else [as in a subject]. That which is self-subsistent however, is neither a composite, but simple, nor in another, but in itself. Hence it is perpetual.

Source attribution

The six books of Proclus, the Platonic successor, on the theology of Plato (vol. 2 of 2) : $b translated from the Greek, to which a seventh book is added, in order to supply the deficiency of another book on this subject, which was written by Proclus, but since lost, also, a translation from the Greek of Proclus' Elements of theology, to which are added a translation of the treatise of Proclus, On providence and fate, a translation of extracts from his treatise, entitled, Ten doubts concerning providence, and a translation of extracts from his treatise on the subsistence of evil; as preserved in the Bibliotheca Gr. of Fabricus, Project Gutenberg eBook #78800

Proposition Xlviii. Proposition L.