(Hare Krishna painted on a car door, Haight-Ashbury, 1967.)
"Śrī Caitanya Mahāprabhu replied, 'Whoever chants the holy name of Kṛṣṇa just once is worshipable and is the topmost human being.'"
(Caitanya-caritāmṛta Madhya 15.106)
"Śrīla Bhaktisiddhānta Sarasvatī Ṭhākura says that a person who simply chants the holy name of Kṛṣṇa once becomes perfect and should be regarded as a Vaiṣṇava."
(Caitanya-caritāmṛta Madhya 15.106, Purport)
"If one hears a person say even once the word 'Kṛṣṇa,' that person should be accepted as the best man out of the common group."
(Nectar of Instruction 5, Purport)
"One who chants the holy name of the Lord is immediately freed from the reactions of unlimited sins, even if he chants indirectly [to indicate something else], jokingly, for musical entertainment, or even neglectfully. This is accepted by all the learned scholars of the scriptures."
"One may or may not know the value of chanting the Hare Kṛṣṇa mantra, but if one somehow or other chants it, he will immediately be purified, just as one who takes a potent medicine will feel its effects, regardless of whether he takes it knowingly or unknowingly."
(Śrīmad-Bhāgavatam 6.2.19, Purport)
"So this Kṛṣṇa consciousness movement is so nice that even people joke with us, 'Hare Kṛṣṇa,' it goes to his credit, even joking."
(Srila Prabhupada Lecture, Vrindavan, September 11, 1975)
"So simply by remembering the holy name of the Lord, Viṣṇu, one is purified in any stage of life. That is a fact. It is said..., there is a Bengali verse which says, eka kṛṣṇa nāme yata pāpa hare, ai haya tati pāpa karibare nare: 'By chanting once the holy name of Kṛṣṇa, the sinful man can vanquish so much volumes of sinful activities, reaction, that he's unable to perform.' A sinful man is very expert to commit sinful activities, but the holy name of Kṛṣṇa is so strong that he will be unable to commit so much sins as can be extinguished simply by uttering once the name of Lord Viṣṇu or Kṛṣṇa. This is a fact."
(Srila Prabhupada Lecture, London, August 22, 1971)
"As a result of chanting the Hare Kṛṣṇa maha-mantra, one makes such great advancement in spiritual life that simultaneously his material existence terminates and he receives love of Godhead. The holy name of Kṛṣṇa is so powerful that by chanting even one name, one very easily achieves these transcendental riches."
(Caitanya-caritāmṛta Ādi 8.28)
Prabhupada: This hari-kīrtana, chant. Somehow or other, induce them to chant Hare Kṛṣṇa—everything all right. By flattering, by soliciting, by giving him prasāda, by elevating him, that 'You are the best man in the world,' in this way inducing him, 'Please chant Hare Kṛṣṇa,' then he will be rectified. This is Hare Kṛṣṇa movement. There is no other way. He is ruined, and the more the Kali-yuga advances, he becomes more and more ruined. All other attempts will failure. Don't you see in your country the LSD-addicted hippies? Government spends so much money to rectify them—failure. But as soon as they come to our camp, immediately success. How it is possible?
Devotee: By this chanting of the holy name.
Prabhupada: That is the amazement. That is the amazement of Professor Judah and all others, that 'How it is happening? There is something in the Hare Kṛṣṇa movement.'"
(Srila Prabhupada Morning Walk, Johannesburg, October 17, 1975)
"So the Hare Kṛṣṇa movement is so strong, and indirectly, directly, or some way or other, if you chant Hare Kṛṣṇa, you become benefited. It is so. So if you neglectfully chant Hare Kṛṣṇa you become so benefited, then how much you will be benefited if you carefully chant Hare Kṛṣṇa. That should be the ideal."
(Srila Prabhupada Lecture, Vrindavan, September 8, 1975)