Devotee: Who is Śrīdhara Svāmī, you quoted?
Prabhupāda: Hmm?
Devotee: Śrīdhara Svāmī?
Prabhupāda: Oh, this question is not good for you. You are student in Kṛṣṇa consciousness, and you do not know Śrīdhara Svāmī? The commenter, the commentator of Śrīmad-Bhāgavatam. In our book, Śrīmad-Bhāgavatam, we have mentioned several times Śrīdhara Svāmī. Śrīdhara Svāmī is one of the ācāryas. He happens to be in the Viṣṇu Svāmī sampradāya, the party, the devotees who are coming from Rudra.
There are four sampradāyas, devotees: Brahmā-sampradāya, Lakṣmī-sam . . . Śrī-sampradāya, Rudra-sampradāya and Kumāra-sampradāya. They are mahājanas. Svayambhūr nāradaḥ . . . svayambhūr nāradaḥ śambhuḥ (SB 6.3.20). Svayambhū is Brahmā, from him one disciplic succession is coming. We belong to that disciplic succession. And there is another disciplic succession from Lord Śiva, Śambhu. There is another disciplic succession from Lakṣmī, the goddess of fortune, and another disciplic succession from the Kumāras, cātur-sanā, Kumāras.
So these sampradāya are bona fide sampradāyas. Sampradāya-vihīnā ye. If anyone is not within these four sampradāyas, then his spiritual activities are not bona fide. Sampradāya-vihīnā ye mantrās te niṣphalā matāḥ (Padma Purāṇa). Niṣphalā—he is simply wasting his time. Mahājano yena gataḥ sa panthāḥ (CC Madhya 17.186): you have to follow the original ācāryas, mahājanas, then you shall be on the right path; otherwise you are mislead.
So Śrīdhara Svāmī belongs to the Śambhu, from Lord Śiva, the party. The devotees . . . as there are political parties, they are, all the parties, they are meant for national improvement, similarly, these four parties, although they are called parties, but their aim is how to satisfy Viṣṇu.