In the Fifth Canto of Śrīmad-Bhāgavatam, 6th Chapter, 18th verse, Nārada also says to Yudhiṣṭhira, "My dear King, it is Lord Kṛṣṇa, known as Mukunda, who is the eternal protector of the Pāṇḍavas and the Yadus. He is also your spiritual master and instructor in every respect. He is the only worshipable God for you. He is very dear and affectionate, and He is the director of all your activities, both individual and familial. And what's more, He sometimes carries out your orders as if He were your messenger! My dear King, how very fortunate you are, because for others all these favors given to you by the Supreme Lord would not even be dreamt of." The purport to this verse is that the Lord easily offers liberation, but He rarely agrees to offer a soul devotional service because by devotional service the Lord Himself becomes purchased by the devotee. The Happiness of Becoming One with the Supreme
Śrīla Rūpa Gosvāmī says that if brahmānanda, or the happiness of becoming one with the Supreme, is multiplied by one trillionfold, still it cannot be compared with an atomic fraction of the happiness derived from the ocean of devotional service.
In the Hari-bhakti-sudhodaya Prahlāda Mahārāj, while satisfying Lord Nṛsiṁhadeva by his prayers, says: "My dear Lord of the universe, I am feeling transcendental pleasure in Your presence and have become merged in the ocean of happiness. I now consider the happiness of brahmānanda to be no more than the water in the impression left by a cow's hoof in the earth, compared to this ocean of bliss." Similarly, it is confirmed in the Bhāvārtha-dīpikā, Śrīdhara Svāmī's commentary on the Śrīmad-Bhāgavatam: "My dear Lord, some of the fortunate persons who are swimming in the ocean of Your nectar of devotion, and who are relishing the nectar of the narration of Your pastimes, certainly know ecstasies which immediately minimize the value of the happiness derived from religiousness, economic development, sense gratification and liberation. Such a transcendental devotee regards any kind of happiness other than devotional service as no better than straw in the street." Attracting Kṛṣṇa
Śrīla Rūpa Gosvāmī has stated that devotional service attracts even Kṛṣṇa. Kṛṣṇa attracts everyone, but devotional service attracts Kṛṣṇa. The symbol of devotional service in the highest degree is Rādhārāṇī. Kṛṣṇa is called Madana-mohana, which means that He is so attractive that He can defeat the attraction of thousands of Cupids. But Rādhārāṇī is still more attractive, for She can even attract Kṛṣṇa. Therefore devotees call Her Madana-mohana-mohanī—the attractor of the attractor of Cupid.
To perform devotional service means to follow in the footsteps of Rādhārāṇī, and devotees in Vṛndāvana put themselves under the care of Rādhārāṇī in order to achieve perfection in their devotional service. In other words, devotional service is not an activity of the material world; it is directly under the control of Rādhārāṇī. In Bhagavad-gītā it is confirmed that the mahātmās, or great souls, are under the protection of daivī prakṛti, the internal energy—Rādhārāṇī. So, being directly under the control of the internal potency of Kṛṣṇa, devotional service attracts even Kṛṣṇa Himself.