TEXT: When someone heard the chanting of the holy name from the mouth of Sri Caitanya Mahaprabhu, and someone else heard this chanting from that second person, and someone again heard this chanting from the third person, everyone in all countries became a Vaisnava through such disciplic succession. Thus everyone chanted the holy name of Krsna and Hari, and they danced, cried and smiled.

PURPORT: The transcendental power or potency of the Hare Krsna maha-mantra is herein explained. First, the holy name is vibrated by Sri Caitanya Mahaprabhu. When someone hears from Him directly, he is purified. When another person hears from that person, he also is purified. In this way the purification process is advanced among pure devotees. Sri Caitanya Mahaprabhu is the Supreme Personality of Godhead, and no one can claim His potency. Nonetheless, if one is a pure devotee, hundreds and thousands of men can be purified by his vibration. This potency is within every living being, provided he chants the Hare Krsna maha-mantra offenselessly and without material motives. When a pure devotee chants offenselessly, another person will become a Vaisnava, and from him another Vaisnava will emerge. This is the parampara system.

Srila Prabhupada; Sri Caitanya-caritamrta Madhya-lila 17.48-49