Continuing a short series on Romans 8: [Of vv. 4-13] You must not understand flesh here as denoting only unchastity or spirit as denoting only the inner heart. Here St. Paul calls flesh (as does Christ in John 3) everything born of flesh, i.e. the whole human being with body and soul, reason and senses, since everything in him tends toward the flesh. That is why you should know enough to call that person "fleshly" who, without grace, fabricates, teaches and chatters about high spiritual matters. You can learn the same thing from Galatians, chapter 5, where St. Paul calls heresy and hatred works of the flesh. And in Romans, chapter 8, he says that, through the flesh, the law is weakened. He says this, not of unchastity, but of all sins, most of all of unbelief, which is the most spiritual of vices.