If a cloth merchant visits a place where everyone lives naked, he is not going to benefit from it. He may lose his principal goods.
If a person wishes to learn the science of evaluating gems from a blind person or asks for the kingdom from paupers, that would be his foolishness and mistake.
If someone wishes to learn astrology or acquire knowledge of Vedas from a dumb person, or wishes to know about music from a deaf person, this would be an utter foolish effort.
Similarly, if anyone tries to get rid of his sins by serving and worshipping other gods and goddesses,. and thus achieve salvation, this would be an act of foolishness. Without obtaining initiation of True-name from True Guru, he will only bear the pricks