When we keep on sinning without ever attempting to turn from it or restrain it, it is because we are still slaves to sin.
Never forget that sin is God's enemy- and Satan's friend. Sin is so serious that it caused Jesus to leave Heaven's glory and come into this earth to die as the final and complete sin. Don't take sin lightly. Repent of it when it rears its ugly head, and with God's help cast it out of your life.
"What shall we say them? Shall we go on sinning so that grace may increase? By no means! We died to sin; how can we live in it any longer?" Romans 6:1-2