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.
Srimad Bhagavata Purana
श्रीमद्भागवतमहापुराणम्
मूल श्लोकः
हृदयं चास्य निर्भिन्नं चन्द्रमा धिष्ण्यमाविशत् । मनसांशेन येनासौ विक्रियां प्रतिपद्यते
hṛdayaṃ cāsya nirbhinnaṃ candramā dhiṣṇyamāviśat | manasāṃśena yenāsau vikriyāṃ pratipadyate
SB 3.6.24