The Pure Devotional Service

As stated by Śrīla Rūpa Gosvāmī in Bhakti-rasāmṛta-sindhu:

The Nārada-pañcarātra also says:

“One should be free from all material designations and cleansed of all material contamination. He should be restored to his pure identity, in which he engages his senses in the service of the proprietor of the senses. That is called devotional service.” This is also called bhāgavata-dharma. Without material aspirations, one should simply serve Kṛṣṇa, as advised in Bhagavad-gītā, Nārada-pañcarātra and Śrīmad-Bhāgavatam. Bhāgavata-dharma is the process of religion enunciated by pure devotees, direct representatives of the Supreme Personality of Godhead like Nārada, Śukadeva Gosvāmī and their humble servants in the disciplic succession. By understanding bhāgavata-dharma, one immediately becomes free from material contamination. Living entities, who are part and parcel of the Supreme Personality of Godhead, are loitering in this material world suffering. When they are instructed by the Lord Himself about bhāgavata-dharma and they adopt it, that is victory for the Lord, for He then reclaims these fallen souls. A devotee following the principles of bhāgavata-dharma feels very much obligated to the Supreme Personality of Godhead. He can understand the difference between life without bhāgavata-dharma and life with bhāgavata-dharma and thus he ever remains obliged to the Lord. Taking to Kṛṣṇa consciousness and bringing fallen souls to Kṛṣṇa consciousness is victory for Lord Kṛṣṇa.

“The supreme occupation [dharma] for all humanity is that by which men can attain to loving devotional service unto the transcendent Lord. Such devotional service must be unmotivated and uninterrupted in order to completely satisfy the self.” (Bhāg. 1.2.6) Therefore Śrīmad-Bhāgavatam is the pure transcendental process of religion.

Source: Srimad Bhagavatam 6.16.40