For Paul, "holiness," that is, walking by means of the Holy Spirit, has two aspects. On the one hand, it means abstaining from some sins—absolutely. Since in Christ believers have died to both sin (the flesh) and the law, they are to serve God "in the newness of the Spirit" (Rom 7:6). They must put to death the former way of life (Rom 6:1-18; 8:12-13; Col 3:5-11), portrayed in Galatians 5:19-21 as "the works of the flesh," which refers to life before and outside Christ. Such a life is no longer an option for the new people of God, who indeed have become a people by the indwelling of the Spirit of God. Paul, therefore, understands "putting to death" the works of the flesh as the empowering work of the Spirit (Rom 8:12-13).
On the other hand, "holiness" also (especially) means the Holy Spirit living in believers, reproducing the life of Christ within and among them, particularly in dieir communal relationships. To do otherwise is to "grieve the Holy Spirit o f God" (Eph 4:30), who by his presence has given them both unity and mutual growth. For this reason, Paul's most common language for the people of God is "the saints" (= God's holy people). They live differendy in their relationships with one another, and are empowered to do so, because they are Spirit people, whatever else they may be.
On the other hand, "holiness" also (especially) means the Holy Spirit living in believers, reproducing the life of Christ within and among them, particularly in dieir communal relationships. To do otherwise is to "grieve the Holy Spirit o f God" (Eph 4:30), who by his presence has given them both unity and mutual growth. For this reason, Paul's most common language for the people of God is "the saints" (= God's holy people). They live differendy in their relationships with one another, and are empowered to do so, because they are Spirit people, whatever else they may be.
- Gordon D. Fee, Paul, the Spirit, and the People of God. p109.