Romans 8:6-7

Romans 8:6-7. For to be carnally minded is death; but to be spiritually minded is life and peace. Because the carnal mind is enmity against God: for it is not subject to the law of God, neither indeed can be.

The old nature never will obey the law of God; it never can do so. What then is to be done with it? Improve it? Nay, my brethren, the only thing to be done with it is to let it die, and then to bury it. In baptism you have a most significant symbol of what is to be done with the flesh; you are to treat it as a dead thing, and therefore to bury it. Let the old life be crucified and put to death with Christ, and let the new life take its place.