1. Srila Bhaktisiddhanta Sarasvati Prabhupada on loud chanting

    It is necessary that you call on Him, loudly uttering the maha-mantra. When you loudly recite Sri Krishna’s names and keep track of the number of times that they are uttered, then all evils are steadily overcome and lethargy vanishes with all of its concomitant defects. At that time even persons who are of an antagonistic nature, apathetic to Hari, will be forced to give up their mockery. “Those who come to scoff will remain to pray” with you.

    Srila Bhaktisiddhanta Sarasvati Thakura, from “Sri Chaitanya’s Teachings”