First Lord Kṛṣṇa made His parents and elders appear. Then Kṛṣṇa Himself, with the sentiments and complexion of Rādhikā, appeared in Navadvīpa, like the full moon, from the womb of mother Śacī, which is like an ocean of pure milk.
(Sri Caitanya caritamrta-----1:4:271-272----translation).

"Lord Kṛṣṇa desired to taste the limitless nectarean mellows of the love possessed by one of His multitude of loving damsels (Śrī Rādhā), and so He has assumed the form of Lord Caitanya. He has tasted that love while hiding His own dark complexion with Her effulgent yellow color. May that Lord Caitanya confer upon us His grace."
(Sri Caitanya caritamrta---1:4:275----translation).

By His mercy I have attained the shelter of the great personality Śrī Raghunātha dāsa Gosvāmī, and by His mercy I have found the refuge of Śrī Svarūpa Dāmodara.
Anyone desiring to become expert in the service of Śrī Śrī Rādhā and Kṛṣṇa should always aspire to be under the guidance of Svarūpa Dāmodara Gosvāmī, Rūpa Gosvāmī, Sanātana Gosvāmī and Raghunātha dāsa Gosvāmī. To come under the protection of the Gosvāmīs, one must get the mercy and grace of Nityānanda Prabhu.
(Sri Caitanya caritamrta---1:5:202----translation and purport).

I was unwilling to drink the nectar of devotional service possessed of renunciation, but Sanātana Gosvāmī, out of his causeless mercy, made me drink it, even though I was otherwise unable to do so. Therefore he is an ocean of mercy. He is very compassionate to fallen souls like me, and thus it is my duty to offer my respectful obeisances unto his lotus feet." Kṛṣṇadāsa Kavirāja Gosvāmī also, in the last section of the Caitanya-caritāmṛta, specifically mentions the names of Rūpa Gosvāmī, Sanātana Gosvāmī and Śrīla Jīva Gosvāmī and offers his respectful obeisances unto the lotus feet of these three spiritual masters, as well as Raghunātha dāsa. Śrīla Raghunātha dāsa Gosvāmī also accepted Sanātana Gosvāmī as the teacher of the science of devotional service. Śrīla Rūpa Gosvāmī is described as the bhakti-rasācārya, or one who knows the essence of devotional service. His famous book Bhakti-rasāmṛta-sindhu is the science of devotional service, and by reading this book one can understand the meaning of devotional service. Another of his famous books is the Ujjvala-nīlamaṇi. In this book he elaborately explains the loving affairs and transcendental activities of Lord Kṛṣṇa and Rādhārāṇī.
(Sri Caitanya caritamrta---1:5:203----purport).

All glory, all glory to the lotus feet of Lord Nityānanda, by whose mercy I have attained Śrī Rādhā-Govinda!
Śrīla Narottama dāsa Ṭhākura, who is famous for his poetic composition known as Prārthanā, has lamented in one of his prayers, "When will Lord Nityānanda be merciful upon me so that I will forget all material desires?" Śrīla Narottama dāsa Ṭhākura confirms that unless one is freed from material desires to satisfy the needs of the body and senses, one cannot understand the transcendental abode of Lord Kṛṣṇa, Vṛndāvana. He also confirms that one cannot understand the loving affairs of Rādhā and Kṛṣṇa without going through the direction of the six Gosvāmīs. In another verse Narottama dāsa Ṭhākura has stated that without the causeless mercy of Nityānanda Prabhu, one cannot enter into the affairs of Rādhā and Kṛṣṇa.
(Sri Caitanya caritamrta---1:5:204----translation and purport).

All the inhabitants of Vṛndāvana are Vaiṣṇavas. They are all-auspicious because somehow or other they always chant the holy name of Kṛṣṇa. Even though some of them do not strictly follow the rules and regulations of devotional service, on the whole they are devotees of Kṛṣṇa and chant His name directly or indirectly. Purposely or without purpose, even when they pass on the street they are fortunate enough to exchange greetings by saying the name of Rādhā or Kṛṣṇa. Thus directly or indirectly they are auspicious.
The present city of Vṛndāvana has been established by the Gauḍīya Vaiṣṇavas since the six Gosvāmīs went there and directed the construction of their different temples. Of all the temples in Vṛndāvana, ninety percent belong to the Gauḍīya Vaiṣṇava sect, the followers of the teachings of Lord Caitanya Mahāprabhu and Nityānanda, and seven temples are very famous. The inhabitants of Vṛndāvana do not know anything but the worship of Rādhā and Kṛṣṇa. In recent years some unscrupulous so-called priests known as caste gosvāmīs have introduced the worship of demigods privately, but no genuine and rigid Vaiṣṇavas participate in this. Those who are serious about the Vaiṣṇava method of devotional activities do not take part in such worship of demigods.
The Gauḍīya Vaiṣṇavas never differentiate between Rādhā-Kṛṣṇa and Lord Caitanya. They say that since Lord Caitanya is the combined form of Rādhā-Kṛṣṇa, He is not different from Rādhāand Kṛṣṇa. But some misled people try to prove that they are greatly elevated by saying that they like to chant the holy name of Lord Gaura instead of the names of Rādhā and Kṛṣṇa. Thus they purposely differentiate between Lord Caitanya and Rādhā-Kṛṣṇa. According to them, the system of nadīyā-nāgarī, which they have recently invented in their fertile brains, is the worship of Gaura, Lord Caitanya, but they do not like to worship Rādhā and Kṛṣṇa. They put forward the argument that since Lord Caitanya Himself appeared as Rādhā and Kṛṣṇa combined, there is no necessity of worshiping Rādhā and Kṛṣṇa. Such differentiation by so-called devotees of Lord Caitanya Mahāprabhu is considered disruptive by pure devotees. Anyone who differentiates between Rādhā-Kṛṣṇa and Gaurāṅga is to be considered a plaything in the hands of māyā.
There are others who are against the worship of Caitanya Mahāprabhu, thinking Him mundane. But any sect that differentiates between Lord Caitanya Mahāprabhu and Rādhā-Kṛṣṇa, either by worshiping Rādhā-Kṛṣṇa as distinct from Lord Caitanya or by worshiping Lord Caitanya but not Rādhā-Kṛṣṇa, is in the group of prākṛta-sahajiyās.
Śrīla Kṛṣṇadāsa Kavirāja Gosvāmī, the author of Śrī Caitanya-caritāmṛta, predicts in verses 225 and 226 that in the future those who manufacture imaginary methods of worship will gradually give up the worship of Rādhā-Kṛṣṇa, and although they will call themselves devotees of Lord Caitanya, they will also give up the worship of Caitanya Mahāprabhu and fall down into material activities. For the real worshipers of Lord Caitanya, the ultimate goal of life is to worship Śrī Śrī Rādhā and Kṛṣṇa.
(Sri Caitanya caritamrta---1:5:232----purport).

There are two kinds of devotional service: the way of pāñcarātrika regulative principles and the way of bhāgavata transcendental loving service. The love of Godhead of those engaged in pāñcarātrika regulative principles depends more or less on the opulent and reverential platform, but the worship of Rādhā and Kṛṣṇa is purely on the platform of transcendental love. Even persons who play as the superiors of Kṛṣṇa also take the chance to offer transcendental loving service to the Lord. The service attitude of the devotees who play the parts of superiors of the Lord is very difficult to understand, but it can be very plainly understood in connection with the superexcellence of their particular service to Lord Kṛṣṇa. A vivid example is the service of mother Yaśodā to Kṛṣṇa, which is distinct. In the feature of Nārāyaṇa, the Lord can accept services only from His associates who play parts in which they are equal to or less than Him, but in the feature of Lord Kṛṣṇa He accepts service very plainly from His fathers, teachers and other elders who are His superiors, as well as from His equals and His subordinates. This is very wonderful.
(Sri Caitanya caritamrta---1:6:53----purport).

Although Kṛṣṇa is the reservoir of all pleasure, He has a special intention to taste Himself by accepting the form of a devotee. It is to be concluded that although Lord Caitanya is present in the form of a devotee, He is Kṛṣṇa Himself. Therefore Vaiṣṇavas sing, śrī-kṛṣṇa-caitanya rādhā-kṛṣṇa nahe anya: "Rādhā and Kṛṣṇa combined together are Śrī Kṛṣṇa Caitanya Mahāprabhu." And as Śrī Svarūpa Dāmodara Gosvāmī has said, caitanyākhyaṁ prakaṭam adhunā tad-dvayaṁ caikyam āptam: Rādhā and Kṛṣṇa assumed oneness in the form of Śrī Caitanya Mahāprabhu.
(Sri Caitanya caritamrta---1:7:11----purport).

When will there be eruptions on my body as soon as I chant the name of Lord Caitanya, and when will there be incessant torrents of tears as soon as I chant the holy names Hare Kṛṣṇa? When will Lord Nityānanda be merciful toward me and free me from all desires for material enjoyment? When will my mind be completely freed from all contamination of desires for material pleasure? Only at that time will it be possible for me to understand Vṛndāvana. Only if I become attached to the instructions given by the six Gosvāmīs, headed by Rūpa Gosvāmī and Raghunātha dāsa Gosvāmī, will it be possible for me to understand the conjugal love of Rādhā and Kṛṣṇa." By attachment to the devotional service of Lord Caitanya Mahāprabhu, one immediately comes to the ecstatic position. When he develops his love for Nityānanda Prabhu he is freed from all attachment to the material world, and at that time he becomes eligible to understand the Lord's pastimes in Vṛndāvana. In that condition, when one develops his love for the six Gosvāmīs, he can understand the conjugal love betweenRādhā and Kṛṣṇa. These are the different stages of a pure devotee's promotion to conjugal love in the service of Rādhā and Kṛṣṇa in an intimate relationship with Śrī Caitanya Mahāprabhu.
(Sri Caitanya caritamrta---1:7:17----purport).

Distinguishing between pure devotees and internal or confidential devotees, Śrī Rūpa Gosvāmī, in his book Upadeśāmṛta, traces the following gradual process of development. Out of many thousands of karmīs, one is better when he is situated in perfect Vedic knowledge. Out of many such learned scholars and philosophers, one who is actually liberated from material bondage is better, and out of many such persons who are actually liberated, one who is a devotee of the Supreme Personality of Godhead is considered to be the best. Among the many such transcendental lovers of the Supreme Personality of Godhead, the gopīs are the best, and among the gopīs Śrīmatī Rādhikā is the best. Śrīmatī Rādhikā is very dear to Lord Kṛṣṇa, and similarly Her ponds, namely, Śyāma-kuṇḍa and Rādhā-kuṇḍa, are also very dear to the Supreme Personality of Godhead.
(Sri Caitanya caritamrta---1:7:18-19----purport).

Without oṁkāra, no Vedic mantra is successful. The Gosvāmīs therefore declare that praṇava (oṁkāra) is the complete representation of the Supreme Personality of Godhead, and they have analyzed oṁkāra in terms of its alphabetical constituents as follows:
a-kāreṇocyate kṛṣṇaḥ sarva-lokaika-nāyakaḥ
u-kāreṇocyate rādhā ma-kāro jīva-vācakaḥ
Oṁkāra is a combination of the letters a, u and m. A-kāreṇocyate kṛṣṇaḥ: the letter a (a-kāra) refers to Kṛṣṇa, who is sarva-lokaika-nāyakaḥ, the master of all living entities and planets, material and spiritual. Nāyaka means "leader." He is the supreme leader (nityo nityānāṁ cetanaś cetanānām (Kaṭha Upaniṣad 2.2.13)). The letter u (u-kāra) indicates Śrīmatī Rādhārāṇī, the pleasure potency of Kṛṣṇa, and m (ma-kāra) indicates the living entities (jīvas). Thus oṁ is the complete combination of Kṛṣṇa, His potency and His eternal servitors. In other words, oṁkāra represents Kṛṣṇa, His name, fame, pastimes, entourage, expansions, devotees, potencies and everything else pertaining to Him. As Caitanya Mahāprabhu states in the present verse of Śrī Caitanya-caritāmṛta, sarva-viśva-dhāma: oṁkāra is the resting place of everything, just as Kṛṣṇa is the resting place of everything (brahmaṇo hi pratiṣṭhāham).
(Sri Caitanya caritamrta---1:7:128----purport).