Progress And Perfection

Εἰ καὶ τελείους ἡμᾶς εἶναι ὁ θεῖος βούλεται νόμος, ὁμώνυμε, ἀλλὰ κατὰ ἀνάβασιν καὶ προκοπὴν πρὸς τὴν τελείωσιν φθάσαντας, πρότερον γάλακτι ποτιζομένους, ὡς ἀρτιγένητα βρέφη, καὶ ἐν αὐτῷ εἰς σωτηρίαν αὐξάνοντας. Ἅγιος Ἰσίδωρος Του Πηλουσιώτου, Βιβλίον Πρῶτον, Ἐπιστολή ΥΜΑ' Ἰσιδορῳ Διακονῳ Source: Migne PG 78.425b

Even if the Divine Law wishes us to be perfect, 1 my namesake, so that we might come to ascent and progress to perfection, we first drink milk, as a new born child, and by that grow to salvation. Saint Isidore of Pelusium, Book 1, Letter 441, To the Deacon Isidore 1 Mt 5.48 2 1 Pet 2.5