By associating with persons for whom the Supreme Personality of Godhead, Mukunda, is the all in all, one can hear of His powerful activities and soon come to understand them. The activities of Mukunda are so potent that simply by hearing of them one immediately associates with the Lord. For a person who constantly and very eagerly hears narrations of the Lord’s powerful activities, the Absolute Truth, the Personality of Godhead in the form of sound vibrations, enters within his heart and cleanses it of all contamination. On the other hand, although bathing in the Ganges diminishes bodily contaminations and infections, this process and the process of visiting holy places can cleanse the heart only after a long time. Therefore who is the sane man who will not associate with devotees to quickly perfect his life? (SB 5.18.11)
…Bathing in the Ganges can certainly cure one of many infectious diseases, but it cannot cleanse one’s materially attached mind, which creates all kinds of contaminations in material existence. However, one who directly associates with the Supreme Lord by hearing of His activities cleanses the dirt from his mind and very soon comes to Kṛṣṇa consciousness.
…All the great ācāryas strongly recommend that people be given a chance to hear about the Supreme Lord. Then success is assured. The more we cleanse the dirt of material attachment from our hearts, the more we will be attracted by Kṛṣṇa’s name, form, qualities, paraphernalia and activities. This is the sum and substance of the Kṛṣṇa consciousness movement. (from purport SB 5.18.11)
Full Text and Purport
The Hare Krishna Movement 