Bhagavad Gita 7.4
भूमिरापोऽनलो वायुः खं मनो बुद्धिरेव च।
अहङ्कार इतीयं मे भिन्ना प्रकृतिरष्टधा।।7.4।।
Bhumiraponalo vayuh kham mano buddhireva cha
Ahankara itiyam me bhinna prakritirashtadha
Simple meaning, written by AIEarth, water, fire, air, ether, mind, intelligence and ego are the eight divisions of material nature.