They (the Six Gosvamis) were very, very expert in studying sastra very scrutinizingly. Why they studied so much? Because they wanted to establish sad-dharma, real type of religion, bhakti. They are quoting, therefore, from so many, nana-sastra

Expressions researched:
"were very, very expert in studying śāstra very scrutinizingly"

Lectures

Nectar of Devotion Lectures

They (the Six Gosvamis) were very, very expert in studying śāstra very scrutinizingly. Nānā-śāstra-vicāraṇaika-nipuṇau sad-dharma-saṁsthāpakau. Why they studied so much? Because they wanted to establish sad-dharma, real type of religion, bhakti. They are quoting, therefore, from so many, nānā-śāstra. Nānā-śāstra-vicāraṇaika-nipuṇau sad-dharma-saṁsthāpakau lokānāṁ hita-kāriṇau. That is welfare activity.

730131 - Lecture NOD - Calcutta:

Prabhupāda: This Mahārāja Bharata was the son of Ṛṣabhadeva and under whose name . . . after whose name this planet is called Bhārata-varsa. This, the same Bharata Mahārāja, he left this world at very young age, twenty-four years. Young wife, children, kingdom, everything he left. Then he developed some attachment for a young deer. So he had to take the birth in the shape of a deer. The next birth he remained silent, Jaḍa Bharata. So Jaḍa Bharata story is there in the Śrīmad-Bhāgavatam. Very enlightening.

(aside) Go on.

Mādhavānanda: "In the Bhāgavatam, Sixth Canto, Eleventh Chapter, twenty-third verse (SB 6.11.23), there is a similar statement by Vṛtrāsura, who addresses the Lord as follows: 'My dear Lord, by leaving Your transcendental service I . . ."

Prabhupāda: Just see. Bhakti-rasāmṛta-sindhu, Rūpa Gosvāmī, he's presenting this Bhakti-rasāmṛta-sindhu, quoting from so many scriptures. Nānā-śāstra-vicāraṇaika-nipuṇau. They were very, very expert in studying śāstra very scrutinizingly. Nānā-śāstra-vicāraṇaika-nipuṇau sad-dharma-saṁsthāpakau (Ṣaḍ Gosvāmy Aṣṭaka). Why they studied so much? Because they wanted to establish sad-dharma, real type of religion, bhakti. They are quoting, therefore, from so many, nānā-śāstra.

Nānā-śāstra-vicāraṇaika-nipuṇau sad-dharma-saṁsthāpakau lokānāṁ hita-kāriṇau. That is welfare activity. Lokānāṁ hita-kāriṇau. These people are trying to give some service to the daridra-nārāyaṇa, but they do not know actually what is jīve dayā. This is jīve daya. Lokānāṁ hita-kāriṇau. They should know things with reference to the authorized scripture. Not that I manufacture some words according to my whims. That is not service to the hu . . . that is misleading, disservice. Because, if they are kept in ignorance, what is the value of such service? Here is. He does not manufacture anything. He's giving immediately evidence, reference to the authorized scripture.

That is the way of presenting things. Not that, "I think," "In my opinion." What you are? But in, in Vaiṣṇava philosophy, even Caitanya Mahāprabhu, although He was Kṛṣṇa Himself, whenever He spoke something, immediately He gave evidence from the śāstra. Even Kṛṣṇa, while He was speaking Bhagavad-gītā, He also gave reference to the Vedānta-sūtra: brahma-sūtra-padaiś caiva hetumadbhir viniścitaiḥ (BG 13.5). He was giving reference to the Brahmā-sūtra. That is the way of authorized presentation. Kṛṣṇa is Supreme Personality of Godhead, but He was also giving reference. He also said, yaḥ śāstra-vidhim utsṛjya vartate kāma-kārataḥ (BG 16.23).

We cannot give up śāstras. If we give up śāstra, then Kṛṣṇa says, sa siddhiṁ sāvāpnoti na sukhaṁ na parāṁ gatim (BG 16.23). If we give up śāstra, if we manufacture our own words, own śāstra, these are all rascaldom. That should not be accepted. So here you see Rūpa Gosvāmī's writing. The śloka, number, canto—everything is given. Nānā-śāstra-vicāraṇaika-nipuṇau.