“We believe, teach, and confess that the unregenerate will of man is not only turned away from God, but also has become an enemy of God, so that it only has an inclination and desire for that which is evil and contrary to God….
If the carnal mind is enmity against God, the flesh certainly does not love God; if it cannot be subject to the law of God, it cannot love God. If the carnal mind is enmity against God, the flesh sins, even when we do external civil works. If it cannot be subject to the law of God, it certainly sins even when, according to human judgment, it possesses deeds that are excellent and worthy of praise….
The Scriptures deny to the intellect, heart, and will of the natural man all aptness, skill, capacity, and ability to think, to understand, to be able to do, to begin, to will, to undertake, to act, to work, or concur in working anything good and right in spiritual things of himself.”
Augustine of Hippo
“For the mind that is set on the flesh is hostile to God, for it does not submit to God’s law; indeed, it cannot. Those who are in the flesh cannot please God.” (Romans 8:7,8)