EN XXVIIIa: μετὰ τὸ ἐγνωκέναι

The specific form, ‘after having learned’, appears only in Origen, exhMar, XXIII: τὰ γὰρ εἴδωλα τῶν ἐθνῶν δαιμόνια. οἷον δέ ἐστι τὸ καταλιπόντα τὸν χρηστὸν Χριστοῦ ζυγὸν καὶ τὸ ‘ἐλαφρὸν’ αὐτοῦ ‘φορτίον’ πάλιν ἑαυτὸν ὑποβαλεῖν ζυγῷ δαιμόνων καὶ φορτίον βαστάξαι βαρυτάτης ἁμαρτίας μετὰ τὸ ἐγνωκέναι ἡμᾶς ὅτι ‘σποδὸς ἡ καρδία᾽ τῶν εἰδώλοις λατρευόντων.

EN XXVIIIb: ἐπὶ τὸ λῦσαι

In order to denote a certain goal that is pursued or meant, the preposition ἐπὶ is naturally followed by the article τὸ and an infinitive. Turner was wrong to dispute this, while arguing for ἐπὶ τῷ. But this structure, once followed by an infinitive, actually means the cause of what the infinitive suggests. This is the equivalent of an English verb expressing a feeling at something having happened. This at is in fact the expression analogous to ἐπὶ τῷ. Alternatively, the same expression may mean at in the sense of ‘nearby’. Neither of these senses is relevant to this Scholion, where a purpose for doing something (‘to loose the seals’) is meant. Although it is abundantly present in Greek literature, I adduce only a few examples from Didymus, which do not exhaust his usage of the idiom.