For we (ἡμεις γαρ [hēmeis gar]). We Christians as opposed to the legalists. Through the Spirit by faith (πνευματι ἐκ πιστεως [pneumati ek pisteōs]). By the Spirit (Holy Spirit) out of faith (not law). Clear-cut repetition to make it plain.
Robertson, A.T. Word Pictures in the New Testament. Nashville, TN: Broadman Press, 1933. Print.