We say, the sastra says, that by chanting Hare Krsna mantra, you become cleansed of your sinful activities. That's a fact. But if somebody thinks that "I shall go on committing sinful activity and chant Hare Krsna mantra so it will be adjusted, neutralized, this is the most sinful activity, namno balat, by the strength of chanting, committing sin. So similarly on the strength of Bhagavad-gita, if one wants to prove his foolish philosophy, that is a great offense.
Lecture on Bhagavad-gita 2.33-35, London, 3 September, 1973