“There is therefore now no condemnation to them which are in Christ Jesus, who walk not after the flesh, but after the Spirit.” - Rom. 8:1

By “them which are in Christ Jesus,” St. Paul evidently means, those who truly believe in him; those who, “being justified by faith, have peace with God through our Lord Jesus Christ.” They who thus believe do no longer “walk after the flesh,” no longer follow the motions of corrupt nature, but “after the Spirit”; both their thoughts, words, and works are under the direction of the blessed Spirit of God.