The Apostle Paul
Romans 8:7BSB·traditional attribution

because the mind of the flesh is hostile to God: It does not submit to God’s law, nor can it do so.

John Calvin Reformed @genevareformer

7. Because the minding of the flesh, The order which the Apostle observes ought to be noticed. He begins in Romans 8:5, or at the end of Romans 8:4, with two characters — the carnal and, the spiritual. He takes the carnal first, because it is the first as to us in order of time.

Matthew Henry Presbyterian @wholebiblehenry

I. The apostle here beings with one signal privilege of true Christians, and describes the character of those to whom it belongs: There is therefore now no condemnation to those that are in Christ Jesus, Rom 8:1. This is his triumph after that melancholy complaint and conflict in the foregoing chapter - sin remaining, disturbing, vexing, but, blessed be God, not ruining.

Commenting on Romans 8:1-9

John Gill Reformed Baptist @doctorgill

Because the carnal mind is enmity against God,.... These words contain a reason why the issue of carnal mindedness is death; because the carnal mind, the wisdom of the flesh, is not only an enemy, but enmity itself against God: against his being; it reasons against it; it wishes he was not; it forms unworthy notions of him; thinks him such an one as itself...