In the beginning one should very regularly chant Śrī Gaurasundara's holy name and then chant the holy name of Lord Nityānanda. Thus one's heart will be cleansed of impure desires for material enjoyment. Then one can approach Vṛndāvana-dhāma to worship Lord Kṛṣṇa. Unless one is favored by Lord Caitanya and Nityānanda, there is no need to go to Vṛndāvana, for unless one's mind is purified, he cannot see Vṛndāvana, even if he goes there. Actually going to Vṛndāvana involves taking shelter of the Six Gosvāmīs by reading theBhakti-rasāmṛta-sindhu, Vidagdha-mādhava, Lalita-mādhava and the other books that they have given. In this way one can understand the transcendental loving affairs between Rādhā and Kṛṣṇa. Kabe hāma bujhaba se yugala-pirīti. The conjugal love between Rādhā and Kṛṣṇa is not an ordinary human affair; it is fully transcendental. In order to understand Rādhā and Kṛṣṇa, worship Them and engage in Their loving service, one must be guided by Śrī Caitanya Mahāprabhu, Nityānanda Prabhu and the Six Gosvāmīs, Lord Caitanya's direct disciples.
(Sri Caitanya Caritamrta-----1:8:31-----purport).

In the Bhakti-rasāmṛta-sindhu, the transcendental qualities of Śrī Kṛṣṇa are mentioned. Among these, fifty are primary (ayaṁ netā su-ramyāṅgaḥ, etc.), and in minute quantity they were all present in the body of Śrī Haridāsa Paṇḍita. Since every living entity is a part of the Supreme Personality of Godhead, all fifty of these good qualities of Śrī Kṛṣṇa are originally minutely present in every living being. Due to his contact with material nature, these qualities are not visible in the conditioned soul, but when one becomes a purified devotee, they all automatically manifest themselves. This is stated in Śrīmad-Bhāgavatam (5.18.12), as mentioned in the text below.
(Sri Caitanya Caritamrta-----1:8:57-----purport).

The real purpose of life, therefore, is to satisfy the Supreme Personality of Godhead. Śrīla Rūpa Gosvāmī describes in his Bhakti-rasāmṛta-sindhu that devotional service is so exalted that it is beneficial and auspicious for every man. Śrī Caitanya Mahāprabhu also declared that to propagate the bhakti cult of devotional service in human society, one does not need to be very rich. Anyone who knows the art can do it and thus render the highest benefit to humanity. Lord Caitanya Mahāprabhu takes the part of a gardener because although a gardener is naturally not a very rich man, he has some fruits and flowers. Any man can collect some fruits and flowers and satisfy the Supreme Personality of Godhead in devotional service, as the Lord recommends in the Bhagavad-gītā (9.26):
patraṁ puṣpaṁ phalaṁ toyaṁ yo me bhaktyā prayacchati
tad ahaṁ bhakty-upahṛtam aśnāmi prayatātmanaḥ
(Sri Caitanya Caritamrta-----1:9:44-----purport).

In the Gaura-gaṇoddeśa-dīpikā (180) Śrī Rūpa Gosvāmī is described to be the gopī named Śrī Rūpa-mañjarī. In the Bhakti-ratnākara there is a list of the books Śrī Rūpa Gosvāmī compiled. Of all his books, the following sixteen are very popular among Vaiṣṇavas: (1) Haṁsadūta, (2) Uddhava-sandeśa, (3) Kṛṣṇa-janma-tithi-vidhi, (4 and 5) Rādhā-kṛṣṇa-gaṇoddeśa-dīpikā, Bṛhat (major) and Laghu (minor), (6) Stavamālā, (7) Vidagdha-mādhava, (8) Lalita-mādhava, (9) Dāna-keli-kaumudi, (10) Bhakti-rasāmṛta-sindhu (this is the most celebrated book by Śrī Rūpa Gosvāmī), (11) Ujjvala-nīlamaṇi, (12) Ākhyāta-candrikā, (13) Mathurā-mahimā, (14) Padyāvalī, (15) Nāṭaka-candrikā and (16) Laghu-bhāgavatāmṛta. Śrī Rūpa Gosvāmī gave up all family connections, joined the renounced order of life and divided his money, giving fifty percent to the brāhmaṇas and Vaiṣṇavas and twenty-five percent to his kuṭumba (family members), and keeping twenty-five percent for personal emergencies. He met Haridāsa Ṭhākura in Jagannātha Purī, where he also met Lord Caitanya and His other associates. Śrī Caitanya Mahāprabhu used to praise the handwriting of Rūpa Gosvāmī. Śrīla Rūpa Gosvāmī could compose verses according to the desires of Śrī Caitanya Mahāprabhu, and by His direction he wrote two books named Lalita-mādhava and Vidagdha-mādhava. Lord Caitanya desired the two brothers, Sanātana Gosvāmī and Rūpa Gosvāmī, to publish many books in support of the Vaiṣṇava religion. When Sanātana Gosvāmī met Śrī Caitanya Mahāprabhu, the Lord advised him also to go to Vṛndāvana.
(Sri Caitanya Caritamrta-----1:10:84-----purport).

"O descendant of King Bharata, one who desires to be free from all miseries must hear about, glorify and also remember the Supreme Personality of Godhead, who is the Supersoul, the controller and the savior from all miseries." (S.B.2:1:5) This is the summary of all the activities of a Vaiṣṇava, and the same instruction is repeated here (kṛṣṇa-smṛti vinu haya niṣphala jīvana). Śrīla Rūpa Gosvāmī states in his Bhakti-rasāmṛta-sindhu, avyartha-kālatvam: (Cc. Madhya 23.18–19) A Vaiṣṇava must be very alert not to waste even a second of his valuable lifetime. This is a symptom of a Vaiṣṇava. But association with pounds-and-shillings men, or viṣayīs, materialists who are simply interested in sense gratification, pollutes one's mind and hampers such continuous remembrance of Lord Kṛṣṇa. Śrī Caitanya Mahāprabhu therefore advised, asat-saṅga-tyāga—ei vaiṣṇava-ācāra: a Vaiṣṇava should behave in such a way as to never associate with nondevotees or materialists (CC.2:22:87). One can avoid such association simply by always remembering Kṛṣṇa within his heart.
(Sri Caitanya Caritamrta-----1:12:51-----purport).

Śrīla Bhaktisiddhānta Sarasvatī has given a description of these books. The Bhakti-rasāmṛta-sindhu is a great book of instruction on how to develop devotional service to Lord Kṛṣṇa and follow the transcendental process. It was finished in the year 1463 Śakābda (A.D. 1541). This book is divided into four parts: pūrva-vibhāga (eastern division), dakṣiṇa-vibhāga (southern division), paścima-vibhāga (western division) and uttara-vibhāga (northern division). In the pūrva-vibhāga, there is a description of the permanent development of devotional service. The general principles of devotional service, the execution of devotional service, ecstasy in devotional service and ultimately the attainment of love of Godhead are described. In this way there are four laharīs (waves) in this division of the ocean of the nectar of devotion.
(Sri Caitanya Caritamrta-----2:1:41-----purport).

In the northern division (uttara-vibhāga) there is a description of the indirect mellows of devotional service—namely, devotional service in laughter, devotional service in wonder, and devotional service in chivalry, pity, anger, dread and ghastliness. There are also mixing of mellows and the transgression of different humors. Thus there are nine waves in this part. This is but a brief outline of the Bhakti-rasāmṛta-sindhu.
The Vidagdha-mādhava is a drama of Lord Kṛṣṇa's pastimes in Vṛndāvana. Śrīla Rūpa Gosvāmī finished this book in the year 1454 Śakābda (A.D. 1532). The first part of this drama is called veṇu-nāda-vilāsa, the second part manmatha-lekha, the third part rādhā-saṅga, the fourth part veṇu-haraṇa, the fifth part rādhā-prasādana, the sixth part śarad-vihāra, and the seventh and last part gaurī-vihāra.

(Sri Caitanya Caritamrta-----2:1:41-----purport).

There is also a book called Ujjvala-nīlamaṇi, a transcendental account of loving affairs that includes metaphor, analogy and higher bhakti sentiments. Devotional service in conjugal love is described briefly in the Bhakti-rasāmṛta-sindhu, but it is very elaborately discussed in the Ujjvala-nīlamaṇi. This book describes different types of lovers, their assistants, and those who are very dear to Kṛṣṇa. There is also a description of Śrīmatī Rādhārāṇī and other female lovers, as well as various group leaders. Messengers and the constant associates, as well as others who are very dear to Kṛṣṇa, are all described. The book also relates how love of Kṛṣṇa is awakened and describes the ecstatic situation, the devotional situation, permanent ecstasy, disturbed ecstasy, steady ecstasy, different positions of different dresses, feelings of separation, prior attraction, anger in attraction, varieties of loving affairs, separation from the beloved, meeting with the beloved, and both direct and indirect enjoyment between the lover and the beloved. All this has been very elaborately described.

(Sri Caitanya Caritamrta-----2:1:41-----purport).

The ecstatic transformations of the body described in such exalted literatures as the Bhakti-rasāmṛta-sindhu are practically not seen in this material world. However, these symptoms were perfectly present in the body of Śrī Caitanya Mahāprabhu. These symptoms are indicative of mahābhāva, or the highest ecstasy. Sometimes sahajiyās artificially imitate these symptoms, but experienced devotees reject such imitations immediately. The author admits herein that these symptoms are not to be found anywhere but in the body of Śrī Caitanya Mahāprabhu.

(Sri Caitanya Caritamrta-----2:2:11-----purport).