Paul now focuses on the reconciliation he mentions in v. 20. We were alienated (21) but through Christ's death we have been reconciled to God (22a). The purpose of this reconciliation is that Christ might present us to the Father perfectly holy (22b). Whereas v. 20 might have implied universal reconciliation, v. 23 makes it clear that perseverance in faith and hope in the gospel are essential for final salvation.
Καὶ ὑμᾶς ποτε ὄντας ἀπηλλοτριωμένους καὶ ἐχθροὺς τῇ διανοίᾳ
And ( although ) you, who once were alienated and hostile in mind,
ἐν τοῖς ἔργοις τοῖς πονηροῖς,
( resulting in) doing evil deeds,
νυνὶ δὲ ἀποκατήλλαξεν ἐν τῷ σώματι τῆς σαρκὸς αὐτοῦ διὰ τοῦ θανάτου
( nevertheless ), He has now reconciled (you) in his body of flesh by his death,
παραστῆσαι ὑμᾶς ἁγίους καὶ ἀμώμους καὶ ἀνεγκλήτους κατενώπιον αὐτοῦ,
in order that He might present you holy and blameless and above reproach before Him,
εἴ γε ἐπιμένετε τῇ πίστει
if indeed you continue in the faith,
τεθεμελιωμένοι καὶ ἑδραῖοι
( in that you) are established and steadfast,
καὶ μὴ μετακινούμενοι ἀπὸ τῆς ἐλπίδος τοῦ εὐαγγελίου οὗ ἠκούσατε, τοῦ κηρυχθέντος ἐν πάσῃ κτίσει τῇ ὑπὸ τὸν οὐρανόν, οὗ ἐγενόμην ἐγὼ Παῦλος διάκονος.
( and in that you are) not shifting from the hope of the gospel that you heard, which has been proclaimed in all creation under heaven, and of which I, Paul, became a minister.