Guru cannot manufacture something. He must quote from the śāstra and then tell to his disciple. So disciple, as soon as he receives a message from guru corroborated by the śāstra, then he should take it as fact. This is the way. Why there should be any more doubt?
Prabhupāda: So sādhu śāstra guru vākya. So we have to accept the authority of śāstra, guru, and sādhu. So those who are sādhu, they accept Caitanya Mahāprabhu. The guru in the..., they accept. And śāstra, there is acceptance. So, therefore, it is confirmed. Not only He, any avatāra, he must be confirmed by these three sources: sādhu, śāstra, guru. I accept Caitanya Mahāprabhu because my Guru Mahārāja accepted. He accepted Caitanya Mahāprabhu as Kṛṣṇa; his Guru Mahārāja accepted. And the śāstra is there. When guru says that Caitanya Mahāprabhu is Kṛṣṇa, he quotes śāstra. The śāstra, guru, and those who are actually devotees, sādhu, they also accept. This is the evidence.
Devotee (1) (woman): Prabhupāda, is Lord Caitanya always carrying on saṅkīrtana in the spiritual world?
Prabhupāda: Yes. He is the father of the saṅkīrtana movement. Saṅkīrtana-prāyair yajanti hi sumedhasaḥ. This is the statement in the Śrīmad-Bhāgavatam. This Lord, incarnation of Kṛṣṇa, is worshiped by saṅkīrtana yajña, and those who are intelligent, sumedhasaḥ, sharp brain, they worship this Lord by saṅkīrtana. This is the statement in the Bhāgavata. And, therefore, we worship Him with saṅkīrtana. This picture, He is being worshiped by saṅkīrtana. Yajñaiḥ saṅkīrtana-prāyair yajanti (SB 11.5.32). And they are all big men Śrī Advaita, Śrī Gadādhara, Śrīvāsa, and others, followers. That is the proof. Kṛṣṇa-varṇaṁ tviṣākṛṣṇam, He is fair complexioned, but He is always chanting Hare Kṛṣṇa. Kṛṣṇa-varṇam iti, He is describing the science of Kṛṣṇa. These are the statement, and He is doing exactly the same thing. His accepting sannyāsa order is also mentioned in the śāstra. So everything we have to accept through three channels: sādhu, śāstra, guru. Saintly person, they you should accept; guru you should accept; and it must be mentioned in the śāstra. Guru cannot manufacture something. He must quote from the śāstra and then tell to his disciple. So disciple, as soon as he receives a message from guru corroborated by the śāstra, then he should take it as fact. This is the way. Why there should be any more doubt? What is your argument?
Ātreya Ṛṣi: There is no argument, Śrīla Prabhupāda.
Prabhupāda: That's all right.