An ordinary person cannot understand the transcendental ecstasies in the mode of Śrīmatī Rādhārāṇī. Unfit persons who try to understand them are perverted into the sahajiyā, bāula and other sampradāyas. Thus the teachings are perverted. Even learned scholars in the academic field cannot understand the transcendental bliss and ecstasy exhibited by Śrī Caitanya Mahāprabhu and His pure devotees. One must be fit to understand the purport of Śrī Caitanya Mahāprabhu's activities.
(Sri Caitanya Caritamrta----2:2:83----purport).

Advaita Ācārya said, ""My dear friends, what shall I say? Today I have received the highest transcendental pleasure. After many, many days, Lord Kṛṣṇa is in My house.""
This is a song composed by Vidyāpati. Sometimes the word mādhava is misunderstood to refer to Mādhavendra Purī. Advaita Ācārya was a disciple of Mādhavendra Purī, and consequently some people think that He was referring to Mādhavendra Purī by using the word mādhava. But actually this is not the fact. This song was composed to commemorate the separation of Kṛṣṇa from Rādhārāṇī during Kṛṣṇa's absence in Mathurā. It is thought that this song was sung by Śrīmatī Rādhārāṇī when Kṛṣṇa returned. It is technically called Mathurā-viraha.
(Sri Caitanya Caritamrta----2:3:114---translation and purport).

When Śrī Kṛṣṇa left Vṛndāvana and accepted the kingdom of Mathurā, Śrīmatī Rādhārāṇī, out of ecstatic feelings of separation, expressed how Kṛṣṇa can be loved in separation. Thus devotional service in separation is central to this verse. Worship in separation is considered by the Gauḍīya-Mādhva-sampradāya to be the topmost level of devotional service. According to this conception, the devotee thinks of himself as very poor and neglected by the Lord. Thus he addresses the Lord as dīna-dayārdra nātha, as did Mādhavendra Purī. Such an ecstatic feeling is the highest form of devotional service. Because Kṛṣṇa had gone to Mathurā, Śrīmatī Rādhārāṇī was very much affected, and She expressed Herself thus: "My dear Lord, because of Your separation My mind has become overly agitated. Now tell Me, what can I do? I am very poor and You are very merciful, so kindly have compassion upon Me and let Me know when I shall see You." Śrī Caitanya Mahāprabhu was always expressing the ecstatic emotions of Śrīmatī Rādhārāṇī that She exhibited when She saw Uddhava at Vṛndāvana.
(Sri Caitanya Caritamrta----2:4:197----purport).

Conjugal love (mādhurya-rasa) is also known as śṛṅgāra-rasa. It is the conclusion of Śrīmad-Bhāgavatam that in the complete combination of loving service to the Lord—namely in conjugal love—the Supreme Lord fully agrees to be under the control of the devotee. The highest form of conjugal love is represented by Śrīmatī Rādhārāṇī; therefore in the pastimes of Rādhā and Kṛṣṇa we can see that Kṛṣṇa is always subjugated by Śrīmatī Rādhārāṇī’s influence.
(Sri Caitanya Caritamrta----2:8:88----purport).

Among the loving affairs of the gopīs," Rāmānanda Rāya continued, “Śrīmatī Rādhārāṇī’s love for Śrī Kṛṣṇa is topmost. Indeed, the glories of Śrīmatī Rādhārāṇī are highly esteemed in all revealed scriptures.
"Just as Śrīmatī Rādhārāṇī is most dear to Śrī Kṛṣṇa, Her bathing place (Rādhā-kuṇḍa) is also dear to Him. Among all the gopīs, ŚrīmatīRādhārāṇī is supermost and very dear to Lord Kṛṣṇa."
(Sri Caitanya Caritamrta----2:8:98-99----translation).

The name Rādhā is derived from this verse (.s.b.10:30:28), from the words anayārādhitaḥ, meaning "by Her the Lord is worshiped." Sometimes the critics of Śrīmad-Bhāgavatam find it difficult to find Rādhārāṇī’s holy name in that book, but the secret is disclosed here in the word ārādhita, from which the name Rādhā has come. Of course, the name of Rādhārāṇī is directly mentioned in other Purāṇas. This gopī’s worship of Kṛṣṇa is topmost, and therefore Her name is Rādhā, or "the topmost worshiper."
(Sri Caitanya Caritamrta----2:8:100----purport).

If Lord Kṛṣṇa rejected the company of the other gopīs for Śrīmatī Rādhārāṇī, we can understand that Lord Śrī Kṛṣṇa has intense affection for Her."
Rāmānanda Rāya continued, “Please therefore hear from me about the glories of Śrīmatī Rādhārāṇī’s loving affairs. They are beyond compare within these three worlds.
Finding Herself treated equally with all the other gopīs, Śrīmatī Rādhārāṇī displayed Her tricky behavior and left the circle of the rāsa dance. Missing Śrīmatī Rādhārāṇī’s presence, Kṛṣṇa became very unhappy and began to lament and wander throughout the forest to search Her out.
Lord Kṛṣṇa, the enemy of Kaṁsa, took Śrīmatī Rādhārāṇī within His heart, for He desired to dance with Her. Thus He left the arena of the rāsa dance and the company of all the other beautiful damsels of Vraja.
"Being afflicted by the arrow of Cupid and unhappily regretting His mistreating Śrīmatī Rādhārāṇī, Mādhava, Lord Kṛṣṇa, began to search for Her along the banks of the Yamunā River. When He failed to find Her, He entered the bushes of Vṛndāvana and began to lament."
(Sri Caitanya Caritamrta----2:8:103-107----translation).

Although Kṛṣṇa was in the midst of hundreds of thousands of gopīs during the rāsa dance, He still kept Himself in one of His transcendental forms by the side of Śrīmatī Rādhārāṇī.
Lord Kṛṣṇa is equal to everyone in His general dealings, but due to the conflicting ecstatic love of Śrīmatī Rādhārāṇī, there were opposing elements.
(Sri Caitanya Caritamrta----2:8:109-110----translation).

During the rāsa dance, one form of Kṛṣṇa was between every two gopīs. But by the side of Śrīmatī Rādhārāṇī there was only one Kṛṣṇa. Although this was the case, Śrīmatī Rādhārāṇī still manifested disagreement with Kṛṣṇa. This verse is from the Ujjvala-nīlamaṇi (Śṛṅgāra-bheda-kathana 102), written by Śrīla Rūpa Gosvāmī.
(Sri Caitanya Caritamrta----2:8:111----purport).

Within this material universe, the devotees worship that transcendental abode as Goloka Vṛndāvana. Lord Brahmā himself said, "Let me worship that spiritual land where Kṛṣṇa is present." This transcendental Vṛndāvana is not appreciated by those who are not devotees or self-realized souls because this Vṛndāvana-dhāma is all spiritual. The pastimes of the Lord there are also spiritual. None are material. According to a prayer by Śrīla Narottama dāsa Ṭhākura (Prārthanā 1):
āra kabe nitāi-cāṅdera karuṇā karibe
saṁsāra-vāsanā mora kabe tuccha ha’be
"When will Lord Nityānanda have mercy upon me so that I can realize the uselessness of material pleasure?"
viṣaya chāḍiyā kabe śuddha ha’be mana
kabe hāma heraba śrī-vṛndāvana
"When will my mind be cleansed of all material dirt so that I will be able to feel the presence of spiritual Vṛndāvana?"
rūpa-raghunātha-pade haibe ākuti
kabe hāma bujhaba se yugala-pirīti
"When will I be attracted to the instructions of the Gosvāmīs so that I will be able to understand what is Rādhā and Kṛṣṇa and what is Vṛndāvana?"
These verses indicate that one first has to be purified of all material desires and all attraction for fruitive activity and speculative knowledge if one wishes to understand Vṛndāvana.
(Sri Caitanya Caritamrta----2:8:138----purport).

Just as Kṛṣṇa is completely spiritual, the gopīs are also spiritual, and this is confirmed in the Brahma-saṁhitā (5.37):
ānanda-cin-maya-rasa-pratibhāvitābhis
tābhir ya eva nija-rūpatayā kalābhiḥ
goloka eva nivasaty akhilātma-bhūto
govindam ādi-puruṣaṁ tam ahaṁ bhajāmi
"I worship Govinda, the primeval Lord. He resides in His own realm, Goloka, with Rādhā, who resembles His own spiritual figure and who embodies the ecstatic potency (hlādinī). Their companions are Her confidantes, who embody extensions of Her bodily form and who are imbued and permeated with ever-blissful spiritual rasa."
(Sri Caitanya Caritamrta----2:8:139----purport).

"Let Kṛṣṇa, the Supreme Personality of Godhead, be glorified! By virtue of His expanding attractive features, He subjugated the gopīs named Tārakā and Pāli and absorbed the minds of Śyāmā and Lalitā. He is the most attractive lover of Śrīmatī Rādhārāṇī and is the reservoir of pleasure for devotees in all transcendental mellows."
(Sri Caitanya Caritamrta----2:8:142----translation).

“‘Upon seeing His own reflection in a bejeweled pillar of His Dvārakā palace, Kṛṣṇa desired to embrace it, saying, "Alas, I have never seen such a person before. Who is He? Just by seeing Him I have become eager to embrace Him, exactly like Śrīmatī Rādhārāṇī."
(Sri Caitanya Caritamrta----2:8:149----translation).

The essential part of love of Godhead is called mahābhāva, transcendental ecstasy, and that ecstasy is represented by ŚrīmatīRādhārāṇī.
(Sri Caitanya Caritamrta----2:8:160----translation).

"Among the gopīs of Vṛndāvana, Śrīmatī Rādhārāṇī and another gopī are considered chief. But when we compare the gopīs, it appears that Śrīmatī Rādhārāṇī is most important because Her real feature expresses the highest ecstasy of love. The ecstasy of love experienced by the other gopīs cannot be compared to that of Śrīmatī Rādhārāṇī."
This is a quotation from Śrīla Rūpa Gosvāmī’s Ujjvala-nīlamaṇi (Rādhā-prakaraṇa 3).
(Sri Caitanya Caritamrta----2:8:161----translation and purport).

The body of Śrīmatī Rādhārāṇī is a veritable transformation of love of Godhead; She is the dearmost friend of Kṛṣṇa, and this is known throughout the world.
"I worship Govinda, the primeval Lord, who resides in His own realm, Goloka, with Rādhā, who resembles His own spiritual figure and who embodies the ecstatic potency (hlādinī). Their companions are Her confidantes, who embody extensions of Her bodily form and who are imbued and permeated with ever-blissful spiritual rasa."
That supreme ecstasy of Śrīmatī Rādhārāṇī is the essence of spiritual life. Her only business is to fulfill all the desires of Kṛṣṇa.
Śrīmatī Rādhārāṇī is the topmost spiritual gem, and the other gopīs—Lalitā, Viśākhā and so on-are expansions of Her spiritual body.
(Sri Caitanya Caritamrta----2:8:162-165----translation).

Śrīmatī Rādhārāṇī’s transcendental body is brilliant in luster and full of all transcendental fragrances. Lord Kṛṣṇa's affection for Her is like a perfumed massage.
Sugandhi udvartana refers to a paste made of several perfumes and fragrant oils. This paste is massaged all over the body, and in this way the body's dirt and perspiration are removed. Śrīmatī Rādhārāṇī’s body is automatically perfumed, but when Her body is massaged with the scented paste of Lord Kṛṣṇa's affection, Her entire body is doubly perfumed and made brilliant and lustrous. This is the beginning of Kṛṣṇadāsa Kavirāja Gosvāmī’s description of Śrīmatī Rādhārāṇī’s transcendental body. This description (found in verses 165–181) is based on a book by Śrīla Raghunātha dāsa Gosvāmī known as Premāmbhoja-maranda. Śrīla Bhaktivinoda Ṭhākura's translation of the original Sanskrit reads as follows:
“The love of the gopīs for Kṛṣṇa is full of transcendental ecstasy. It appears to be a brilliant jewel, and enlightened by such a transcendental jewel, Rādhārāṇī’s body is further perfumed and decorated with kuṅkuma. In the morning Her body is bathed in the nectar of compassion, in the afternoon in the nectar of youth, and in the evening in the nectar of luster itself. In this way the bathing is performed, and Her body becomes as brilliant as the cintāmaṇi jewel. She is dressed in various kinds of silken garments, one of which is Her natural shyness.
(Sri Caitanya Caritamrta----2:8:166----translation and purport).