Rom 6 v 19 19 I am using a human analogy because of the weakness of your flesh. For just as you offered the parts of yourselves as slaves to impurity, and to greater and greater lawlessness, so now offer them as slaves to righteousness, which results in sanctification. This verse opens an interesting window on the Pauline conception of slavery to sin. Unbelievers are totally subservient to sin as a power that exerts authority over their lives, but the slavery envisioned is not coercion.  People don’t submit to sin against their will. Rather, they “freely” and spontaneously choose to sin. In other words, unbelievers are slaves to sin in that they always desire to carry out the dictates of their master.  This does not mean that those with addictions (e.g., to alcohol, pornography, or gambling) never wish to be freed.  It means that the desire for these things is ultimately greater than the desire to be freed from them. Thomas R. Schreiner, Romans, ed. Robert W. Yarbrough and Joshua W.

  There are, in fact, two quite distinct ways in which the New Testament speaks of crucifixion in relation to holiness. The first is our death to sin through identification with Christ; the second is our death to self through imitation of Christ.  On the one hand, we have been crucified with Christ. But on the other we have crucified (decisively repudiated) our sinful nature with all its desires, so that every day we renew this attitude by taking up our cross and following Christ to crucifixion.  The first is a legal death, a death to the penalty of sin; the second is a moral death, a death to the power of sin.  The first belongs to the past, and is unique and unrepeatable; the second belongs to the present, and is repeatable, even continuous. I died to sin (in Christ) once; I die to self (like Christ) daily. It is with the first of these two deaths that Romans 6 is chiefly concerned, although the first is with a view to the second, and the second cannot take place without the first. J