Compare Hermas, Mandat. I.  Athan. Epist. de Decretis Nic. Syn. xxii.:  οὕτω καὶ τὸ ἄτρεπτον καὶ ἀναλλοίωτον αὐτὸν εἶναι σωθήσεται.  So Aristotle (Metaphys. XI. c. iv. 13) describes the First Cause as ἀπαθὲς καὶ ἀναλλοίωτον.