Romans 6:14

Sin shall not have dominion over you, for you are not under law but under grace.  

Sin is a small word with big consequences.  There is no little sin!  We can reduce the impact of sin in our lives by dealing with it early.  Deal with sin quickly in life, so it does not have dominion because we are under the law of grace.  Grace will cover the sin as we confess the sin and turn away from it.  Keep the guard up and the sin tolerance low, and the devil will be no match for us.