When you were contemplating whether there was a source to the stem of the lotus of your birth and you even entered into that stem, you could not trace out anything. But at that time I manifested My form from within.
Srimad Bhagavata Purana
श्रीमद्भागवतमहापुराणम्
मूल श्लोकः
तुभ्यं मद्विचिकित्सायामात्मा मे दर्शितोऽबहिः । नालेन सलिले मूलं पुष्करस्य विचिन्वतः
tubhyaṃ madvicikitsāyāmātmā me darśito'bahiḥ | nālena salile mūlaṃ puṣkarasya vicinvataḥ
SB 3.9.37