SB 7.4.44
sri-yudhisthira uvaca
devarsa etad icchamo
veditum tava suvrata
yad atmajaya suddhaya
pitadat sadhave hy agham
Translation by His Divine Grace A. C. Bhaktivedanta Swami Srila Prabhupada:
Maharaja Yudhisthira said: O best of the saints among the demigods, O best of spiritual leaders, how did Hiranyakasipu give so much trouble to Prahlada Maharaja, the pure and exalted saint, although Prahlada was his own son? I wish to know about this subject from you.
Purport by His Divine Grace A. C. Bhaktivedanta Swami Srila Prabhupada:
To know about the Supreme Personality of Godhead and the characteristics of His pure devotee, one must inquire from authorities like Devarsi Narada. One cannot inquire about transcendental subject matters from a layman. As stated in Srimad-Bhagavatam (3.25.25), satam prasangan mama virya-samvido bhavanti hrt-karna-rasayanah kathah: only by association with devotees can one authoritatively understand the position of the Lord and His devotees. A devotee like Narada Muni is addressed as suvrata. Su means “good,” and vrata means “vow.” Thus the word suvrata refers to a person who has nothing to do with the material world, which is always bad. One cannot understand anything spiritual from a materialistic scholar puffed up with academic knowledge. As stated in Bhagavad-gita (18.55), bhaktya mam abhijanati: one must try to understand Krsna by devotional service and from a devotee. Therefore Yudhisthira Maharaja was quite right in wanting to learn further about Prahlada Maharaja from Sri Narada Muni.