Could you explain "captivity to the law of sin," Romans 7:23?

Could you explain "captivity to the law of sin," Romans 7:23?

Four laws are in the passage.

   1. "The law of God" is spiritual, holy, just, good (verses 12,14), While the law cannot justify (3:20), in chapter 7 Paul demonstrates that the law cannot sanctify.
   2. "The law of my mind" (verse 23) consents that the law of God is good (verses 16, 18).
   3. "The law of sin" is a principle which opposes the expression of God's law in the life (verses 17-20), even though the inward man delights in it (verse 22), and the mind of the individual willingly desires to comply with it. Frustration and failure confront him at every turn. Thus hedged in, he finds himself taken "into captivity" as a prisoner of war by this sin principle in his members. The problem lies within self: "but I am carnal, sold under sin" (verse 14). Carnal self cannot be controlled by even a spiritual law. Deliverance is found alone through the resources of the risen, glorified Jesus Christ our Lord (verse 25).
   4. "For the law of the Spirit of life in Christ Jesus hath made me free from the law of sin and death" (8:2).

W. Skates