The Christian lives in the Spirit (Gal. 5:15), is filled with the Spirit (Eph. 5:18), is the temple of the Holy Spirit (1 Cor. 6:19), is led by the Spirit, and walks in the Spirit (Gal. 5:16, 18, 25).
Paul makes a contrast between flesh[1] and Spirit (Rom. 8:1, 4, 9, 13; Gal. 3:2; 5:17; 6:8), and the Spirit and letter of the law (Rom. 2:29; 1 Cor. 3:6; Gal. 3:22).