John 8:34

Jesus proceeded to clarify what He meant. He prefaced His declaration with a strong affirmation of its truth (cf. John 8:51; John 8:58). Everyone who commits acts of sin becomes sin’s slave. The Greek present participle poion ("who commits sin" or "who sins") implies continual sinning rather than an occasional lapse. This is a general truth that applies to both believers and unbelievers. People who continually commit sin become the slaves of sin. Sin tends to become habit-forming and addictive. This type of slavery is more fundamental and personal than mere political slavery.

How does this revelation harmonize with Paul’s teaching about the believer’s relationship to sin that he wrote in Romans 6? In Romans 6, Paul explained that at regeneration God broke the chain that makes the believer the slave of sin. Sin does not have the power to enslave us that it did before we believed in Jesus. However believers can become sin’s slaves by practicing sin (Romans 6:16). We do not need to be its slaves any longer since God has broken its enslaving power over us. We are no longer its slaves, but we can still choose to live as its slaves by submitting to temptation. Sin gains power over us when we yield to temptation.

Similarly a heroin addict cannot break his or her addiction without radical treatment. The treatment can result in total rehabilitation, but the former addict can choose to become a slave again by returning to his or her habit. However he or she does not need to return since liberation has taken place. Another illustration is Israel in the Old Testament. Having experienced liberation from the Egyptians the Israelites chose to return to slavery under the Assyrians and Babylonians though they did not need to do that. By continually sinning they set themselves up for these strong enemies to take them captive.