Jayapataka Swami:   Srila Prabhupada was saying how a house somewhere in India was very cheap because it was haunted. No one wanted to rent it, because it had ghosts!! So then he arranged to have a 24 hour kirtan and all the subtle entities they ran away, and then he got a clean house with cheap rent! So if someone still has the habit of some black magic, then the 9th chapter of Bhagavad-gita counteracts that. Normally devotional service also counteracts that. So I don’t see much use of people who do subtle magic or something. One person, he sent some entities to devotees and devotees chanted and the entities were so angry because some of them got liberated. The others did not know what was happening as some of them were disappearing. They came back and killed the person that did the black magic. So it is very dangerous to do black magic against devotees because devotees have the white magic! Haribol! You like that? Black magic against white magic!