The following, by Srila Bhaktivinoda Thakura, a predecessor spiritual master of the Hare Krsna movement, is taken from an essay that first appeared in the Thakura's monthly journal Sajjana-tosani, published in the 1880s.
THE RELIGION preached by [Caitanya] Mahaprabhu is universal and not exclusive. … The principle of kirtana as the future church of the world invites all classes of men, without distinction of caste or clan, to the highest cultivation of the spirit. This church, it appears, will extend all over the world and take the place of all sectarian churches, which exclude outsiders from the precincts of the mosque, church, or temple.
Lord Caitanya did not advent Himself to liberate only a few men of India. Rather, His main objective was to emancipate all living entities of all countries throughout the entire universe and preach the Eternal Religion. Lord Caitanya says in the Caitanya-bhagavata: "In every town, country, and village, My name will be sung." There is no doubt that this unquestionable order will come to pass. …
Oh, for that day when the fortunate English, French, Russian, German, and American people will take up banners, mrdangas [drums], and karatalas [cymbals], and raise kirtana throughout their streets and towns. When will that day come?
The Great Chant for Deliverance
An excerpt from Srila Prabhupada's essay "Chanting the Hare Krsna Mantra"
THE TRANSCENDENTAL vibration established by the chanting of Hare Krsna, Hare Krsna, Krsna Krsna, Hare Hare/ Hare Rama, Hare Rama, Rama Rama, Hare Hare is the sublime method for reviving our transcendental consciousness. As living spiritual souls, we are all originally Krsna conscious entities, but due to our association with matter from time immemorial, our consciousness is now polluted by the material atmosphere. …
The chanting of Hare Krsna, Hare Krsna, Krsna Krsna, Hare Hare is the transcendental process for reviving this original pure consciousness. By chanting this transcendental vibration, we can cleanse away all misgivings within our hearts. The basic principle of all such misgivings is the false consciousness that I am the lord of all I survey.
Krsna consciousness is not an artificial imposition on the mind. This consciousness is the original natural energy of the living entity. When we hear the transcendental vibration, this consciousness is revived. This simplest method of meditation is recommended for this age. By practical experience also, one can perceive that by chanting this maha-mantra, or the Great Chanting for Deliverance, one can at once feel a transcendental ecstasy coming through from the spiritual stratum. …
When one is factually on the plane of spiritual understanding, surpassing the stages of sense, mind, and intelligence, he is then on the transcendental plane. This chanting of the Hare Krsna mantra is enacted from the spiritual platform, and thus this sound vibration surpasses all lower strata of consciousness namely sensual, mental, and intellectual. There is no need, therefore, to understand the language of the mantra, nor is there any need for mental speculation nor any intellectual adjustment for chanting this maha-mantra. It springs automatically from the spiritual platform, and as such, anyone can take part in vibrating this transcendental sound without any previous qualification. …