Frequent in a metaphorical sense for habitual conduct. See Mar 7:5; Joh 8:12; Act 21:21; Rom 6:4; Rom 8:4; 1Co 3:3; Phi 3:18. Never by Paul in the literal sense.
In the Spirit (πνεύματι)
Rather, by the Spirit, as the rule of action. Comp. Gal 6:16; Phi 3:16; Rom 4:12.
Fulfill (τελέσητε)
Bring to fulfillment in action. See on do the law, Gal 5:3.
The lust (ἐπιθυμίαν)
Frequent in Paul, and usually in a bad sense; but see Phi 1:23; 1Th 2:17, and comp. Luk 22:15. The phrase lust or lusts of the flesh occurs also Eph 2:3; 2Pe 2:18; 1Jo 2:16. It means, not the mere sensual desire of the physical nature, but the desire which is peculiar to human nature without the divine Spirit.