Lord Brahmā said: My dear boy Nārada, being merciful to all (including me) you have asked all these questions because I have been inspired to see into the prowess of the Almighty Personality of Godhead.
Srimad Bhagavata Purana
श्रीमद्भागवतमहापुराणम्
मूल श्लोकः
ब्रह्मोवाच । सम्यक्कारुणिकस्येदं वत्स ते विचिकित्सितम् । यदहं चोदितः सौम्य भगवद्वीर्यदर्शने
brahmovāca | samyakkāruṇikasyedaṃ vatsa te vicikitsitam | yadahaṃ coditaḥ saumya bhagavadvīryadarśane
SB 2.5.9