(Click to enlarge photo of Srila Prabhupada preaching in Tompkins Square Park, NYC, 1966)
"Our business is very thankless task. We say any man who is not a devotee, he is rascal. We say generally. It is very harsh word, but we have to use it. As soon as we see that he is not a devotee of Kṛṣṇa, then he's a rascal. How do we say? He is not my enemy, but we have to say because it is stated by Kṛṣṇa.
If we are really Kṛṣṇa conscious, then our business is to repeat the words of Kṛṣṇa. That's all. What is the difference between a Kṛṣṇa's representative and non-representative? The representative of Kṛṣṇa will simply repeat what Kṛṣṇa says. That's all. He becomes representative. It doesn't require much qualification. You simply repeat with firm conviction. As Kṛṣṇa says, sarva-dharmān parityajya mām ekaṁ śaraṇaṁ vraja (BG 18.66). So one who has accepted this fact, that, 'If I surrender to Kṛṣṇa, my all business is successful,' he is Kṛṣṇa's representative. That's all.
You don't require to be very highly educated or advanced. Simply if you simply accept that what Kṛṣṇa says... Just like Arjuna said, sarvam etaṁ ṛtam manye yad vadasi keśava: (BG 10.14) 'My dear Kṛṣṇa, Keśava, whatever You are saying, I accept it, without any change.' That is bhakta. Therefore Arjuna is addressed, bhakto 'si. This is the bhakta's business. Why shall I think of Kṛṣṇa as like me, ordinary man? This is the difference between a bhakta and not bhakta. A bhakta knows that 'I am insignificant, a small spark of Kṛṣṇa. Kṛṣṇa is individual person. I am also individual person. But when we consider about His power and my power, I am most insignificant.' This is understanding of Kṛṣṇa."
(Srila Prabhupada Lecture, London, July 17, 1973)