Pradyumna: "The devotees eternally live in the ocean of devotional service, and they do not care for the rivers. In other words, those who are pure devotees always remain in the ocean of transcendental loving service to the Lord and have no business with the other processes which are compared to the rivers that only gradually come to the ocean. Śrīla Rūpa Gosvāmī prays to his spiritual master Śrīla Sanātana Gosvāmī for the protection of Bhakti-rasāmṛta-sindhu, the ocean of the pure nectar of devotional service, from the argumentative logicians who unnecessarily meddle in the science of service to the Lord. He compares their arguments and logic to volcanic eruptions in the midst of the ocean."
Prabhupāda: Yes. Na tāṁs tarkeṇa yojayet. Acintyāḥ khalu ye bhāvā na tāṁs tarkeṇa yojayet. Simply by arguments, logic, you cannot understand Kṛṣṇa. That is the Vedic injunction. Tarko apratiṣṭho. You cannot establish the truth by simple logic and arguments. You may be very great logician, but somebody may come who is greater logician than you, and he defeats you. That is going on. Tarko apratiṣṭha śrutayo vibhinnām. Now, if you read the Vedas, you'll find some contradiction. Not contradiction. But to the neophyte, it appears to be contradiction. Just like we have cited the example that animal stool is impure, but cow dung is pure. So by logic you can say that "Cow dung is also the stool of an animal. How it becomes pure?" But in Vedas you'll find such things. Therefore by simple studying, without surrendering yourself to the spiritual master, you'll find all these contradictions and you'll be bewildered. Śrutayo vibhinnā. They are not vibhinnā. But to our limited knowledge, sometimes they appear as vibhinnam, different. Śrutayo vibhinnaṁ nāsau munir yasya mataṁ na bhinnam. And you won't find a philosopher who does not agree, who does not disagree with our philosophers.
Therefore dharmasya tattvaṁ nihitaṁ guhāyāṁ mahājano yena gataḥ sa panthāḥ (CC Madhya 17.186). We have to follow the footsteps of great ācāryas. That is the way. These mahājanas are described in the śāstra like Lord Brahma, Lord Śiva, svayambhūr nāradaḥ śambhuḥ kapilaḥ kumāro manuḥ (SB 6.3.20). They are all mentioned. So you follow any one of these great personalities, Brahmā... Brahmā is the greatest personality within this universe, and he has got his sampradāya which is known as Brahma-sampradāya. Similarly Lord Śiva has also a sampradāya which is called Rudra-sampradāya. Similarly, Nārada-Pañcarātra, Kumāra-sampradāya. So follow the sampradāya. Sampradāya vihīnā te mantrās te viphalaṁ matāḥ. If you do not follow any bona fide sampradāya, then your path of spiritual advancement will be baffled. You will simply waste your time. Viphalaṁ matāḥ. So we should follow the footsteps of great ācāryas. Then our progress is positive. There is no fear.