The Vedic literature teaches us to accept the authorized bona fide spiritual master ācārya. Kṛṣṇa is the head of all ācāryas. He is the principal ācārya. From Kṛṣṇa, Brahmā learned this Vedic literature. From Brahmā, Nārada learned this Vedic literature. From Nārada, Vyāsadeva; from Vyāsadeva, Madhvācārya. From Madhvācārya, so many. In this way the paramparā system, the ācārya system, is coming down. So we have to believe that. Mahājano yena gataḥ sa panthāḥ (CC Madhya 17.186).
You have to follow the footprints of ācārya. Not only in the . . . everywhere, the footprints of ācāryas are followed. Just like in your country you are following the footprints of Lord Jesus Christ. Yes, that is the way. Or any ācārya. Because the ācārya, they come here to teach us about Kṛṣṇa consciousness, or God consciousness. That is their business. They have no other business. That is bona fide ācārya. If somebody claims that "I am God," then he is fool number one. At once reject him. One who teaches about the message of God, he is ācārya.
So the Vedic literature teaches us that tarko 'pratiṣṭhaḥ: "In the spiritual matter, you cannot argue." Your argument will be failure because you may be very good arguer, but I may come, I can cut all your arguments. And somebody else comes—he cuts all my arguments. It is a question of logic. So there are many logical experts. So by arguments we cannot reach the Supreme Truth. Tarko 'pratiṣṭhaḥ śrutayo vibhinnāḥ (CC Madhya 17.186).