Prabhupāda: That is another rascaldom. You see how others are taking guru, paramparā system. You are rascal. You will place so many questions. But the answers are already there. Evaṁ paramparā-prāptam (BG 4.2). Guru is he who knows Kṛṣṇa, who explains Kṛṣṇa. That is guru. Otherwise he's not guru.
Dayānanda: Samit-pāṇiḥ śrotriyaṁ brahma-niṣṭham (MU 1.2.12).
Prabhupāda: Ah. Anyone who is Kṛṣṇa conscious, who knows Kṛṣṇa, he is guru. Otherwise all rascals. Why should you go to a rascal? Immediately you can understand he is guru who has fully surrendered to Kṛṣṇa. He is guru. Others? They are all rascals. Na māṁ duṣkṛtino mūḍhāḥ prapadyante narādhamāḥ (BG 7.15). Who has not surrendered to Kṛṣṇa, he is under these four groups: duṣkṛtina, mūḍha, narādhama, māyayāpahṛta-jñāna. They may talk of so much knowledge, but they are rascal fools because they have not surrendered to Kṛṣṇa. All the Māyāvādīs, they are all rascals. They have not surrendered. This is the test. Why don't you take lesson from Bhagavad-gītā? He is guru. One who has surrendered to Kṛṣṇa, one is servant of Kṛṣṇa, he is guru. That is the test. If you want to select a guru, you have to see "Whether this person is fully surrendered to Kṛṣṇa?" Then he is guru. Huh?