Liturgy of St. John of Chrysostom wrote:Κύριε ὁ Θεὸς ἡμῶν, οὗ τὸ κράτος ἀνείκαστον καὶ ἡ δόξα ἀκατάληπτος· οὗ τὸ ἔλεος ἀμέτρητον καὶ ἡ φιλανθρωπία ἄφατος· αὐτός, Δέσποτα, κατὰ τὴν εὐσπλαγχνίαν σου, ἐπίβλεψον ἐφ' ἡμᾶς καὶ ἐπὶ τὸν ἅγιον οἶκον τοῦτον, καὶ ποίησον μεθ' ἡμῶν καὶ τῶν συνευχομένων ἡμῖν, πλούσια τὰ ἐλέη σου καὶ τοὺς οἰκτιρμούς σου.
Here, "αὐτός, Δέσποτα" seems to mean "you, Lord". How is αὐτός being used here?
