One of the central themes of St. Paul is the concept of union with Christ. The apostle deals with this subject at length in Romans chapter six. Using the rite of baptism as a basis, Paul shows how the believer becomes united with Christ in an interpersonal sharing of spirits. He then points out the implications of this relationship for sanctification. Thus sanctification is vitally connected with the relationship of the believer to Christ.
Shelton, R. Larry, "Sanctification in Romans Chapter Six" (1968). Faculty Publications - Portland Seminary. 20.