Along with the cowherd boys and their own groups of calves, Kṛṣṇa came out with an unlimited number of calves assembled. Then all the boys began to sport in the forest in a greatly playful spirit.
In this verse the words kṛṣṇa-vatsair asaṅkhyātaiḥ are significant. The word asaṅkhyāta means "unlimited." Kṛṣṇa's calves were unlimited. We may speak of hundreds, thousands, tens of thousands, hundreds of thousands, millions, billions, trillions, tens of trillions, and so on, but when we go further to speak of numbers impossible for us to count, we are speaking of unlimited numbers. Such unlimited numbers are indicated here by the word asaṅkhyātaiḥ. Kṛṣṇa is unlimited, His potency is unlimited, His cows and calves are unlimited, and His space is unlimited. Therefore He is described in Bhagavad-gītā as Parabrahman. The word brahman means "unlimited," and Kṛṣṇa is the Supreme Unlimited, Parabrahman. Therefore, we should not consider the statements of this verse to be mythological. They are factual, but inconceivable. Kṛṣṇa can accommodate an unlimited number of calves and an unlimited measurement of space. This is neither mythological nor false, but if we study Kṛṣṇa's potency with our limited knowledge, that potency will never be possible to understand. Ataḥ śrī-kṛṣṇa-nāmādi na bhaved grāhyam indriyaiḥ (CC.2:17:136). Our senses cannot perceive how He could keep an unlimited number of calves and cows and have unlimited space in which to do so. But this is answered in the Bṛhad-bhāgavatāmṛta:
evaṁ prabhoḥ priyānāṁ ca
dhāmnaś ca samayasya ca
avicintya-prabhāvatvād
atra kiñcin na durghaṭam
Śrī Sanātana Gosvāmī, in the Bṛhad-bhāgavatāmṛta, states that since everything about Kṛṣṇa is unlimited, nothing is impossible for Him. It is in this sense that we have to understand this verse.
(Srimad Bhagavatam-----10:12:3-----translation and purport).

In his Bṛhad-bhāgavatāmṛta, Śrīla Sanātana Gosvāmī has explained that the attainment of salvation by merging into the Brahman effulgence of the Lord cannot be accepted as the highest success in life, because demons like Kaṁsa, who were famous for killing brāhmaṇas and cows, attained that salvation. For devotees such salvation is abominable.
(Sri Caitanya Caritamrta-----1:5:36-----purport).

By the mercy of Sanātana Gosvāmī I have learned the final conclusions of devotional service, and by the grace of Śrī Rūpa Gosvāmī I have tasted the highest nectar of devotional service.
Śrī Sanātana Gosvāmī Prabhu, the teacher of the science of devotional service, wrote several books, of which the Bṛhad-bhāgavatāmṛta is very famous; anyone who wants to know about the subject matter of devotees, devotional service and Kṛṣṇa must read this book.
(Sri Caitanya Caritamrta-----1:5:203-----translation and purport).

Some of the books compiled by Śrīla Sanātana Gosvāmī were the Hari-bhakti-vilāsa, Bṛhad-bhāgavatāmṛta, Daśama-ṭippanī and Daśama-carita.
Regarding the Bṛhad-bhāgavatāmṛta, there are two parts, both of which deal with the discharge of devotional service. The first part is an analytical study of devotional service, in which there is also a description of different planets, including the earth, the heavenly planets, Brahma-loka and Vaikuṇṭha-loka. There are also descriptions of the devotees, including intimate devotees, most intimate devotees and complete devotees. The second part describes the glories of the spiritual world, known as Goloka-māhātmya-nirūpaṇa, as well as the process of renunciation of the material world. It also describes real knowledge, devotional service, the spiritual world, love of Godhead, attainment of life's destination, and the bliss of the world. In this way there are seven chapters in each part, fourteen chapters in all.
(Sri Caitanya Caritamrta-----2:1:35-----translation and purport).

Śrī Caitanya Mahāprabhu asked, "Of all kinds of distress, what is the most painful?"
Śrī Rāmānanda Rāya replied, "Apart from separation from the devotee of Kṛṣṇa, I know of no unbearable unhappiness."
Concerning this, the Lord states in the Vedic literature:
mām anārādhya duḥkhārtaḥ kuṭumbāsakta-mānasaḥ
sat-saṅga-rahito martyo vṛddha-sevā-paricyutaḥ
"A person who does not worship Me, who is unduly attached to family and who does not stick to devotional service must be considered a most unhappy person. Similarly, one who does not associate with Vaiṣṇavas, or who does not render service to his superior, is also a most unhappy person."
There is also the following statement in the Bṛhad-bhāgavatāmṛta (1.5.44):
sva-jīvanādhikaṁ prārthyaṁ śrī-viṣṇu-jana-saṅgataḥ
vicchedena kṣaṇaṁ cātra na sukhāṁśaṁ labhāmahe
"Out of all kinds of desirable things experienced in the life of a living entity, association with the devotees of the Lord is the greatest. When we are separated from a devotee even for a moment, we cannot enjoy happiness."
(Sri Caitanya Caritamrta-----2:8:248-----translation and purport).

Whatever one does in executing devotional service must be accompanied by the chanting of the holy name of the Lord.” The chanting of the holy name of Kṛṣṇa—Hare Kṛṣṇa, Hare Kṛṣṇa, Kṛṣṇa Kṛṣṇa, Hare Hare/ Hare Rāma, Hare Rāma, Rāma Rāma, Hare Hare—has been praised by Śrīla Rūpa Gosvāmī in his Nāmāṣṭaka (verse 1):
nikhila-śruti-mauli-ratna-mālā-
dyuti-nīrājita-pāda-paṅkajānta
ayi mukta-kulair upāsyamānaṁ
paritas tvāṁ hari-nāma saṁśrayāmi
"O Hari-nāma! The tips of the toes of Your lotus feet are constantly being worshiped by the glowing radiance emanating from the string of gems known as the Upaniṣads, the crown jewels of all the Vedas. You are eternally adored by liberated souls such as Nārada and Śukadeva. O Hari-nāma! I take complete shelter of You."
Similarly, Śrīla Sanātana Gosvāmī has praised the chanting of the holy name as follows in his Bṛhad-bhāgavatāmṛta (1.1.9):
jayati jayati nāmānanda-rūpaṁ murārer
viramita-nija-dharma-dhyāna-pūjādi-yatnam
katham api sakṛd āttaṁ mukti-daṁ prāṇināṁ yat
paramam amṛtam ekaṁ jīvanaṁ bhūṣaṇaṁ me
"All glories, all glories to the all-blissful holy name of Śrī Kṛṣṇa, which causes the devotee to give up all conventional religious duties, meditation and worship. When somehow or other uttered even once by a living entity, the holy name awards him liberation. The holy name of Kṛṣṇa is the highest nectar. It is my very life and my only treasure."
(Sri Caitanya Caritamrta-----3:4:71-----purport).

“Mathurā-Vṛndāvana is My own very dear abode. I want to do many things there to preach Kṛṣṇa consciousness."
Śrī Caitanya Mahāprabhu wanted to accomplish many purposes through the exegetical endeavors of Śrīla Sanātana Gosvāmī. First Sanātana Gosvāmī compiled the book called Bṛhad-bhāgavatāmṛta to teach people how to become devotees, execute devotional service and attain love of Kṛṣṇa. Second, he compiled the Hari-bhakti-vilāsa, wherein he collected authoritative scriptural injunctions regarding how a Vaiṣṇava should behave. Only by the endeavors of Śrī Sanātana Gosvāmī were all the lost places of pilgrimage in the Vṛndāvana area excavated.
(Sri Caitanya Caritamrta-----3:4:81-----translation and purport).

Karmīs may consider the body of a devotee material, but factually it is not, for a devotee has no conception of material enjoyment. If one thinks that the body of a pure devotee is material, he is an offender, for that is a vaiṣṇava-aparādha. In this connection one should consult Śrīla Sanātana Gosvāmī’s Bṛhad-bhāgavatāmṛta (1.3.45 and 2.3.139).
(Sri Caitanya Caritamrta-----3:4:194----purport).

Śrīla Sanātana Gosvāmī compiled the Bṛhad-bhāgavatāmṛta. From this book one can understand who is a devotee, what is the process of devotional service, and who is Kṛṣṇa, the Absolute Truth.
(Sri Caitanya Caritamrta-----3:4:219----translation).

Śrīla Sanātana Gosvāmī also compiled many other books. Who can enumerate them? The basic principle of all these books is to show us how to love Madana-mohana and Govindajī.
The Bhakti-ratnākara refers to the following books by Śrīla Sanātana Gosvāmī: (1) the Bṛhad-bhāgavatāmṛta, (2) the Hari-bhakti-vilāsa and his commentary known as Dig-darśinī, (3) the Līlā-stava and (4) the commentary on the Tenth Canto of Śrīmad-Bhāgavatam known as Vaiṣṇava-toṣaṇī. Sanātana Gosvāmī compiled many, many books, all with the aim of describing how to serve the principal Deities of Vṛndāvana—Govinda and Madana-gopāla. Later, other Deities were gradually established, and the importance of Vṛndāvana increased.
(Sri Caitanya Caritamrta-----3:4:222-----translation and purport).

In the Fifth Canto of Bṛhad-bhāgavatāmṛta (5.44) it is stated that the association of a pure devotee is more desirable than life itself and that in separation from him one cannot even pass a second happily.
(Teachings of Lord Caitanya).