Srimad-Bhagavatam: Canto 3 - Chapter 1 - Verse 24
Sanskrit:
हृदयं चास्य निर्भिन्नं चन्द्रमा धिष्ण्यमाविशत् ।मनसांशेन येनासौ विक्रियां प्रतिपद्यते ॥ २४ ॥
ITRANS:
hṛdayaṁ cāsya nirbhinnaṁcandramā dhiṣṇyam āviśatmanasāṁśena yenāsauvikriyāṁ pratipadyate
Translation:
After that, the heart of the gigantic form separately manifested itself, and into it entered the moon demigod with partial mental activity. Thus the living entity can conduct his mental speculations.