Yudhisthira Maharaja knew that Narada Muni is the supreme spiritual master of human society who can teach the path of spiritual liberation leading to the understanding of the Supreme Personality of Godhead
SB Canto 7
No one is superior to you in peaceful life and mercy, and no one knows better than you how to execute devotional service or how to become the best of the brāhmaṇas. Therefore, you know all the principles of confidential religious life, and no one knows them better than you.
Yudhiṣṭhira Mahārāja knew that Nārada Muni is the supreme spiritual master of human society who can teach the path of spiritual liberation leading to the understanding of the Supreme Personality of Godhead. Actually, it is for this purpose that Nārada Muni compiled his Bhakti-sūtra and gave directions in the Nārada Pañcarātra. To learn about religious principles and the perfection of life, one must take instruction from the disciplic succession of Nārada Muni. Our Kṛṣṇa consciousness movement is directly in the line of the Brahma-sampradāya. Nārada Muni received instructions from Lord Brahmā and in turn transmitted the instructions to Vyāsadeva. Vyāsadeva instructed his son Śukadeva Gosvāmī, who spoke Śrīmad-Bhāgavatam. The Kṛṣṇa consciousness movement is based on Śrīmad-Bhāgavatam and Bhagavad-gītā. Because Śrīmad-Bhāgavatam was spoken by Śukadeva Gosvāmī and Bhagavad-gītā was spoken by Kṛṣṇa, there is no difference between them. If we strictly follow the principle of disciplic succession, we are certainly on the right path of spiritual liberation, or eternal engagement in devotional service.