According to Śrīla Rūpa Gosvāmī, any book which gives enlightenment in the matter of advancing devotional service is considered to be revealed scripture. Śrīla Madhvācārya has also defined revealed scriptures as referring to books such as the Rāmāyaṇa, Mahābhārata, Purāṇas, Upaniṣads, Vedānta—and any other literature which is written in pursuance of such revealed scriptures.
In the Skanda Purāṇa there is the statement, "A person who is constantly engaged in reading literature enunciating the cultivation of Vaiṣṇava devotional service is always glorious in human society, and certainly Lord Kṛṣṇa becomes pleased with him. A person who very carefully keeps such literature at home and offers respectful obeisances to it becomes freed from all sinful reactions and ultimately becomes worshipable by the demigods."
It is also said to Nārada Muni: "My dear Nārada, a person who writes Vaiṣṇava literature and keeps such literature at home has Lord Nārāyaṇa always residing in his house."
In the Śrīmad-Bhāgavatam, Twelfth Canto, 12th Chapter, 12th verse, it is stated: "Śrīmad-Bhāgavatam is the essence of all Vedānta philosophy. Any person who has become attached in some way or other to the reading of Śrīmad-Bhāgavatam cannot have any taste for reading any other literature. In other words, a person who has relished the transcendental bliss of Śrīmad-Bhāgavatam cannot be satisfied with mundane writings."
In the Varāha Purāṇa there is a statement praising the residential quarters of Mathurā. Lord Varāha tells the men of earth: "Any person who becomes attracted to places other than Mathurā will certainly be captivated by the illusory energy." In the Brahmāṇḍa Purāṇa it is said that all the results of traveling on all the pilgrimages within the three worlds can be achieved simply by touching the holy land of Mathurā. In many śāstras (scriptures) it is said that simply by hearing, remembering, glorifying, desiring, seeing, or touching the land of Mathurā, one can achieve all desires.
In the Padma Purāṇa, there is a nice statement praising the service of the Vaiṣṇavas or devotees. In that scripture Lord Śiva tells Pārvatī, "My dear Pārvatī, there are different methods of worship, and out of all such methods the worship of the Supreme Person is considered to be the highest. But even higher than the worship of the Lord is the worship of the Lord's devotees."
A similar statement is in the Third Canto, 7th Chapter, 19th verse, of the Śrīmad-Bhāgavatam: "Let me become a sincere servant of the devotees because by serving them one can achieve unalloyed devotional service unto the lotus feet of the Lord. The service of devotees diminishes all miserable material conditions and develops within one a deep devotional love for the Supreme Personality of Godhead."