My dear King Yudhiṣṭhira, once upon a time the King of the demons, Hiraṇyakaśipu, took his son Prahlāda on his lap and very affectionately inquired: My dear son, please let me know what you think is the best of all the subjects you have studied from your teachers.
Srimad Bhagavata Purana
श्रीमद्भागवतमहापुराणम्
मूल श्लोकः
एकदासुरराट् पुत्रमङ्कमारोप्य पाण्डव । पप्रच्छ कथ्यतां वत्स मन्यते साधु यद्भवान्
ekadāsurarāṭ putramaṅkamāropya pāṇḍava | papraccha kathyatāṃ vatsa manyate sādhu yadbhavān
SB 7.5.4