Greek: καὶ γὰρ Ἰησοῦς Χριστός, τὸ ἀδιάκριτον ἡμῶν ζῆν, τοῦ πατρὸς ἡ γνώμη, ὡς καὶ οἱ ἐπίσκοποι, οἱ κατὰ τὰ πέρατα ὁρισθέντες, ἐν Ἰησοῦ Χριστοῦ γνώμῃ εἰσίν.
"For even Jesus Christ, our inseparable life, is the [manifested] will of the Father; as also bishops, settled everywhere to the utmost bounds [of the earth], are so by the will of Jesus Christ" (New Advent).
"Surely, Jesus Christ, our inseparable life, for His part is the mind of the Father, just as the bishops, though appointed throughout the vast, wide earth, represent for their part the mind of Jesus Christ" (Kleist).
"for Jesus Christ also, our inseparable life, is the mind of the Father, even as the bishops that are settled in the farthest parts of the earth are in the mind of Jesus Christ" (Lightfoot).
"For Jesus Christ—that life from which we can't be torn—is the Father's mind, as the bishops too, appointed the world over, reflect the mind of Jesus Christ" (Cyril Richardson).
For the complete Greek text of Ephesians 3:3ff, see http://www.ccel.org/l/lake/fathers/ignatius-ephesians.htm