The Nama Sankirtan Mission of Sri Chaitanya Mahaprabhu
Lord Chaitanya Mahaprabhu (1486-1535) is the most recent incarnation of the Supreme Personality of Godhead Sri Krishna. He appeared 500 years ago in Navadvip, West-Bengal and started His worldwide Sankirtan mission of propagating the chanting of the holy name of the Lord (the process of self-realization for this age - to meditate upon the sound of the maha-mantra: Hare Krishna Hare Krishna, Krishna Krishna Hare Hare, Hare Rama Hare Rama, Rama Rama Hare Hare).
Lord Caitanya’s desire was that this chanting of the Holy Names be spread to every town and village on the face of the globe, and now His desire is being fulfilled.
Lord Caitanya advocated a process whereby everyone may remain in his present position without change but simply hear from the proper authoritative sources about Kṛṣṇa. Lord Caitanya advised everyone to spread the word of Kṛṣṇa. He advised, "All of you become spiritual masters. Your duty is simply to talk to whomever you meet of Kṛṣṇa or of the instructions given by Kṛṣṇa."
Srila Swami Maharaja Prabhupada on preaching:
This is Caitanya Mahāprabhu's mission. He says, "You become a spiritual master." "How? I have no qualification." "No. You just accept my order?" "So what is your order, sir?" Yāre dekha, tāre kaha 'kṛṣṇa'-upadeśa: (CC Madhya 7.128) "You simply speak the instruction of Kṛṣṇa whoever you meet. Then you become a spiritual master."
Lecture on BG 4.15 -- Bombay, April 4, 1974:
Unfortunately, the Indians are neglecting this Vedic perfection, whereas in other parts of the world, the Europeans and Americans, they are taking interest. So we are not, of course, concerned with any particular nation or country. Our business is to carry out the order of Śrī Caitanya Mahāprabhu: yāre dekha tāre kaha kṛṣṇa-upadeśa (CC Madhya 7.128). Whomever you meet... It doesn't matter whether he is Indian, European, American or African. Anyone, he should be instructed about kṛṣṇa-upadeśa so that his life may be successful and the preacher of Kṛṣṇa consciousness, his life also will become successful. This is Kṛṣṇa consciousness movement.
Lecture on BG 13.3 -- Bombay, September 26, 1973:
So the best service, as recommended by Śrī Caitanya Mahāprabhu, is this preaching work. Yāre dekha tāre kaha kṛṣṇa-kathā, kṛṣṇa-kathā. Āmāra ājñāya guru hañā tāra' ei deśa, yāre dekha tāre kaha kṛṣṇa-upadeśa (CC Madhya 7.128). That's all. This is preaching. Doesn't require any good academic qualification. You have got your tongue. You chant Hare Kṛṣṇa, and whomever you meet, you ask him, "You become a devotee of Kṛṣṇa." That's all. In this way preach and live very nicely by eating kṛṣṇa-prasāda, chanting, dancing, and then get a life like Nārada Muni. This is the formula.
Lecture on SB 1.5.32 -- Vrndavana, August 13, 1974: