The secret of preaching work is that one must keep himself fit in spiritual strength by maintaining always the highest standard of purity in Krsna consciousness. Our process is simple and practically experimented everywhere. Simply by vibrating the Hare Krsna Mahamantra sixteen rounds daily one advances to the stage of sadacara or good habits and when he is pure in consciousness by devotional service, he advances to the stage of ecstatic love of Krsna. We should always pray to Lord Caitanya simply to be engaged in His confidential service by chanting Hare Krsna mantra always. That will purify us and give the strength needed to infuse others with Krsna consciousness.