How does the regenerated nature begin to affect a Christian's walk?

Les explains that after the Holy Spirit enlightens understanding and regenerates the old dead spirit, the believer realizes the old Adam was crucified and placed on the cross in God's mind because God did it on our behalf. Once that is acknowledged, the Spirit regenerates the spirit by outside power, fellowship is restored, and the Holy Spirit comes to dwell in the person. The old sin nature becomes a new divine nature, and this generated part is now in consort with the eternal God. It then begins to have its effect on the body, and that begins in the Christian walk, where the believer grows in grace and knowledge. Les points to Romans 6, where Paul makes plain that we identify with what Christ accomplished on our behalf on the cross, fulfilling God's demand that the soul that sinneth must surely die; He died my death.