Jamieson, Fausset and Brown on Romans 8:7

7. Because the carnal mind is enmity against God--The desire and pursuit of carnal ends is a state of enmity to God, wholly incompatible with true life and peace in the soul.

for it is not subject--"doth not submit itself."

to the law of God, neither indeed can be--In such a state of mind there neither is nor can be the least subjection to the law of God. Many things may be done which the law requires, but nothing either is or can be done because God's law requires it, or purely to please God.