In the Muṇḍaka Upaniṣad (3.2.4) it is said:
nāyam ātmā bala-hīnena labhyo
na ca pramādāt tapaso vāpy aliṅgāt
etair upāyair yatate yas tu vidvāṁs
tasyaiṣa ātmā viśate brahma-dhāma
One cannot attain the goal of life without the mercy of Balarāma. Śrī Narottama dāsa Ṭhākura therefore says, nitāiyera karuṇā habe, vraje rādhā-kṛṣṇa pābe: when one receives the mercy of Balarāma, Nityānanda, one can attain the lotus feet of Rādhā and Kṛṣṇa very easily.
(Srimad Bhagavatam------7:15:45-------purport).

As far as our information goes, Śrīla Jīva Gosvāmī composed and edited at least twenty-five books. They are all very much celebrated, and they are listed as follows: (1) Hari-nāmāmṛta-vyākaraṇa, (2) Sūtra-mālikā, (3) Dhātu-saṅgraha, (4) Kṛṣṇārcā-dīpikā, (5) Gopāla-virudāvalī, (6) Rasāmṛta-śeṣa, (7) Śrī Mādhava-mahotsava, (8) Śrī Saṅkalpa-kalpavṛkṣa, (9) Bhāvārtha-sūcaka-campū, (10) Gopāla-tāpanī-ṭīkā, (11) a commentary on the Brahma-saṁhitā, (12) a commentary on the Bhakti-rasāmṛta-sindhu, (13) a commentary on the Ujjvala-nīlamaṇi, (14) a commentary on the Yogasāra-stava, (15) a commentary on the Gāyatrī-mantra, as described in the Agni Purāṇa, (16) a description of the Lord’s lotus feet derived from the Padma Purāṇa, (17) a description of the lotus feet of Śrīmatī Rādhārāṇī, (18) Gopāla-campū (in two parts) and (19–25) seven sandarbhas: the Krama-, Tattva-, Bhagavat-, Paramātma-, Kṛṣṇa-, Bhakti- and Prīti-sandarbha.
(Sri Caitanya Caritamrta------1:10:85-------purport).

My real riches are Nityānanda Prabhu and the lotus feet of Śrī Rādhā and Kṛṣṇa.” He further prays, “O Lord, kindly give me this opulence. I do not want anything but Your lotus feet as my property.” Śrīla Narottama dāsa Ṭhākura has sung in many places that his real property is the lotus feet of Rādhā and Kṛṣṇa. Unfortunately, we are interested in unreal property and are neglecting our real property
(Sri Caitanya Caritamrta------1:13:124-------purport).

One is elevated to the spiritual world by the spiritual body and is situated either in Goloka Vṛndāvana or in another Vaikuṇṭha planet. In the spiritual body there are no longer material desires, and one is fully satisfied by rendering service to the Supreme Personality of Godhead, Rādhā and Kṛṣṇa. This is the platform of bhakti (hṛṣīkeṇa hṛṣīkeśa-sevanaṁ bhaktir ucyate [Cc. Madhya 19.170]). When the spiritual body, mind and senses are completely purified, one can render service to the Supreme Personality of Godhead and His consort. In Vaikuṇṭha the consort is Lakṣmī, and in Goloka Vṛndāvana the consort is Śrīmatī Rādhārāṇī. In the spiritual body, free from material contamination, one can serve Rādhā-Kṛṣṇa and Lakṣmī-Nārāyaṇa. When one is thus spiritually situated, he no longer thinks of his own personal sense gratification. This spiritual body is called siddha-deha, the body by which one can render transcendental service unto Rādhā and Kṛṣṇa. The process is that of engaging the transcendental senses in loving devotional service. This verse specifically mentions, sakhī-bhāve pāya rādhā-kṛṣṇera caraṇa: only transcendentally elevated persons in the mood of the gopīs can engage in the service of the lotus feet of Rādhā and Kṛṣṇa.
(Sri Caitanya Caritamrta------2:8:229-------purport).

And what is the best type of meditation?" Lord Caitanya inquired. "He who always meditates on the lotus feet of Rādhā and Kṛṣṇa is the best meditator," Rāmānanda Rāya answered. This is also confirmed in Śrīmad-Bhāgavatam (1.2.14): "It is the Supreme Personality of Godhead alone who is the master of all devotees, whose name one should always chant and who should always be meditated upon and worshiped regularly."
(TEACHINGS OF LORD CAITANYA).

Śrī Caitanya Mahāprabhu further inquired, “Out of many types of meditation, which is required for all living entities?” Śrīla Rāmānanda Rāya replied, “The chief duty of every living entity is to meditate upon the lotus feet of Rādhā and Kṛṣṇa.”
(Sri Caitanya Caritamrta------2:8:253-------translation).

By hearing the talks between Rāmānanda Rāya and Śrī Caitanya Mahāprabhu, one becomes enlightened with the transcendental knowledge of the mellows of Rādhā and Kṛṣṇa’s pastimes. Thus one can develop unalloyed love for the lotus feet of Rādhā and Kṛṣṇa.
(Sri Caitanya Caritamrta------2:8:307-------translation).

I offer my respectful obeisances unto the lotus feet of my spiritual master and of all the other preceptors on the path of devotional service, unto all the Vaiṣṇavas and unto the six Gosvāmīs, including Śrīla Rūpa Gosvāmī, Śrīla Sanātana Gosvāmī, Raghunātha dāsa Gosvāmī, Jīva Gosvāmī and their associates. I offer my respectful obeisances unto Śrī Advaita Ācārya Prabhu, Śrī Nityānanda Prabhu and Śrī Caitanya Mahāprabhu, as well as all His devotees, headed by Śrīvāsa Ṭhākura. I then offer my respectful obeisances unto the lotus feet of Lord Kṛṣṇa and Śrīmatī Rādhārāṇī and all the gopīs, headed by Lalitā and Viśākhā.
(Sri Caitanya Caritamrta------3:3:1-------translation).

By offering me the govardhana-śilā, Śrī Caitanya Mahāprabhu has offered me a place near Govardhana Hill, and by offering me the garland of conchshells, He has offered me shelter at the lotus feet of Śrīmatī Rādhārāṇī.”
(Sri Caitanya Caritamrta------3:6:307-------translation).