Characteristics of Pure Devotional Service
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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.
This fact is corroborated by Kṛṣṇa in the Eleventh Canto of