If the preacher is sinful, how can he deliver other sinful men by his so-called preaching? That is not possible

Expressions researched:
"if the preacher is sinful, how he can deliver other sinful men by his so-called preaching"

1971 Conversations and Morning Walks

Caitanya Mahāprabhu's principle is āpani ācari prabhu jīveri śikṣāya. He first of all behaves himself, and then he preaches. So if the preacher is sinful, how he can deliver other sinful men by his so-called preaching. That is not possible. He must be pure, he must be sinless. Then his preaching will be effective.

Room Conversation -- August 14, 1971, London:

Prabhupāda: Yeṣāṁ tv anta-gataṁ pāpaṁ (BG 7.28). One who has finished sinful activities, he can be engaged in God consciousness. One who is engaged in sinful activities, he cannot. Devil citing scripture. A devīl cannot cite scripture. Angel can cite scripture. And according to our ācāryas, Sanātana Gosvāmī, he says that "Don't hear scriptures from the devīl." Avaiṣṇava-mukhodgīrṇaṁ pūtaṁ hari-kathāmṛtaṁ śravaṇaṁ naiva kartavyam." If a devīl's preaching about God, don't hear." If you say, "God is pure, so let me hear about God. It doesn't matter whether he is devīl or angel. It doesn't matter." No. The argument is sarpocchiṣṭaṁ payo yathā. Just like milk is very nourishing food, but if it is touched by the lips, by the tongue of a serpent, it becomes poison. Sarpocchiṣṭaṁ payo yathā. You cannot bring the milk which is touched by the serpent's tongue. So we should receive knowledge of God, message of God, from a person who is not a devīl. Then it will be effective. Otherwise, it will act as poison. Caitanya Mahāprabhu's principle is āpani ācari prabhu jīveri śikṣāya. He first of all behaves himself, and then he preaches. So if the preacher is sinful, how he can deliver other sinful men by his so-called preaching. That is not possible. He must be pure, he must be sinless. Then his preaching will be effective. But in all conditions, if we, with faith and love we chant the holy name of God, we shall become gradually purified. There is no, I mean to say, cause of anxiety. Anyone who will chant this holy name, he'll be purified.