Because the carnal mind is enmity against God: for it is not subject to the law of God, neither indeed can be.
All Commentaries on Romans 8:7 Go To Romans 8
Augustine of Hippo
AD 430
Paul explains why he said “hostile” so that no one should think that there is some nature derived from an opposing principle which God did not create and which fights against him. An enemy of God is one who does not submit to his law and who behaves this way because of the wisdom of the flesh. This means that he seeks worldly goods and is afraid of worldly evils. The normal definition of wisdom is to seek what is good and avoid what is evil. Therefore the apostle is right to describe the wisdom of the flesh as the longing for “goods” which do not remain with a man and when there is a fear for losing those things which one day will have to be left behind anyway. Wisdom of this kind cannot submit to the law of God. It must be destroyed so that the wisdom of the Spirit, which does not place its hope in worldly goods nor is afraid of worldly evils, may take its place. For the one nature of the soul has both the wisdom of the flesh when it follows lower things and the wisdom of the Spirit when it chooses higher things, just as the one nature of water freezes in the cold and melts in the heat.
