ANSWER: Rom. 3:9, "they are all under sin," as explained in verses 10-18. Verses 10-13 inclusive denote a state, as also verse 18. Rom. 6:1, "continue in sin." Here the verb implies a state. The next verse, "we who died to sin, how can we any longer live therein?" The words "live therein" must relate to a state of sin rather than an act. Sin is sometimes used to denote the source whence the evil acts proceed; hence II Thess. 2:3, "man of sin," a man in such a condition that he seems unable to live without sin; also Rom. 5:21, 6:12, "Sin reigned." Here Paul is thinking of sin as a state which he personifies, as he does in Rom. 7:23 and 8:2, "law of sin." The same is true of Rom. 6:6, "in bondage to sin." Christ conceives of sin as a condition in John 8:34, "the bond servant (Greek, slave) of sin."
— Steele's Answers p. 139.