For the flesh lusts against the Spirit, and the Spirit against the flesh: and these are contrary the one to the other: so that you cannot do the things that you would.
All Commentaries on Galatians 5:17 Go To Galatians 5
Tertullian of Carthage
AD 220
Because "the flesh lusteth against the Spirit; ".
Thus, so long as the things which are the Spirit's please them not, the things which are of the flesh will please, as being the contraries of the Spirit. "The flesh "saith (the apostle), "lusteth against the Spirit, and the Spirit against the flesh."