Unless there is spiritual strength, you cannot enthuse others. So we should have to acquire spiritual strength by following the regulative principle. Sanātana Gosvāmī has therefore forbidden.
Avaiṣṇava-mukhodgīrṇam pūta-hari-kathāmṛtam śravanām kartavyam (Padma Purāṇa): "Those who are not following Vaiṣṇava principles, one should not hear from him." Why? It is kṛṣṇa-kathā, Kṛṣṇa's. sarpocchiṣṭa-payo yathā: "Milk is very good, but as soon as it is touched by a serpent, it is no more good; it is harmful." So one must be Vaiṣṇava. Unless one is Vaiṣṇava, it is . . . there is injunction, "Don't hear from him. It will be poisonous." So one who is not following Vaiṣṇava principle, he cannot speak about Vaiṣṇavism. It is harmful. That is forbidden by ācāryas, Sanātana Gosvāmī. If somebody says: "What is the harm? He is chanting Hare Kṛṣṇa . . ." He cannot chant. That is a show-bottle chant. That is not effective. But even taking that "Anyone who is chanting, let me hear," no. Sanātana Gosvāmī, "No, don't hear." It will be harmful more than . . . in other words, if you are not following the Vaiṣṇava principle, you don't chant. It will not be effective. Did you not see the difference last night? There were many other, they could not join in the dancing. So far gathering men, if you do not gather intelligent men, then what is the use of gathering men? Ekaś candras tamo hanti na ca tārā sahasraśaḥ: "If there is one moon, that is sufficient. What is the use of millions of stars?" If one is perfect Vaiṣṇava, that is sufficient.