The acaryas explain that when Nityananda goes out to sell the holy name, first He gives a free sample of His ecstasy of love for Caitanya Mahaprabhu. Sometimes people go out to the streets to hand out free samples of shampoo, laundry detergent, or whatever. The purpose of such distribution is to entice you to come back and purchase a bigger bottle at the full price. Lord Nityananda used the same method, giving out small samples of His deep compassion and His intense service attitude toward Lord Caitanya. He wanted to give everyone the holy name, and this intensity caused anyone who saw Him to become affected by His desire. Just seeing Lord Nityananda awakened faith in others’ hearts. Thus He gave both the holy name and the faith required to taste it.
(LFD, Vol2, Faith—The Price for the Holy Name, Pg 88, 3rd paragraph)