{Every one that committeth sin is the bondservant of sin}
(pas ho poi(936e) t(886e) hamartian doulos estin [t(8873) hamartias]). The
Western class omits 	(8873) hamartias (sin), but that is the idea
anyhow. Note the use of poi(936e) (present active participle,
continuous habit or practice), not poi(8873)as (aorist active
participle for single act), precisely as in  1Jo 3:4-8 . Note
also  3:21  for ho poi(936e) t(886e) al(8874)heian (the one who practises
the truth). Sin, like the worst narcotic, is habit forming. Hence
the problem today for criminologists for paroled or pardoned
criminals nearly always go back to crime, sink again into sin,
the slaves of sin. Xenophon has this notion of the slavery of sin
(_Memor_. IV. 5. 3). So Paul clearly in  Ro 6:17,20  "slaves of
sin" (douloi t(8873) hamartias).