Commentaries:
Robertson's Word Pictures (NT)
Every one that committeth sin is the bondservant of sin (pav o poiwn thn amartian doulov estin 0:0-1:1. Note also John 3:21 for o poiwn thn alhqeian (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 Romans 6:17, Romans 6:20 "slaves of sin" (douloi thv amartiav).
Other Robertson's Word Pictures (NT) entries containing John 8:34:
John 10:1
1 John 3:10
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