Until we chant purely, we are all offenders to the holy name to one degree or another. There are three stages in chanting: the offensive stage, the clearing stage, and the offenseless stage. One comes to the clearing stage, and can continue to make progress in that stage, by the attitude in his chanting. That attitude is the sincere desire to clean the anarthas from our heart and to stop committing offenses. To do that, we must look deeper inside ourselves.
(Collected Letters to My Disciples, Vol 3, Pg 36, 2nd Paragraph)