bhumir apo’ nalo vayuh
kham mano buddhir eva ca
ahankara itiyam me
bhinna prakrtir astadha
(Knowledge of the Absolute, Text 4 Chapter 7)
Earth, water, fire,air, ether, mind, intelligence and false ego-all together these eight constitute My separate material energies.
*** The science of God analyzes the constitutional position of God and his diverse energies. Material nature is called prakrti, or the energy of the Lord in his different purusa incarnations(expressions) as described in the Satvata-tantra: ” For material creation, Lord Krsna’s plenary expansion assumes three Visnus. The first one, Maha-Visnu, creates the total material energy, known as the mahat-tattva. The second, Garbhodakasayi Vishnu, enters into all the universes to create diversities in each of them. The third, Ksirodakasayi Vishnu is diffused as the all-pervading Supersoul in all the universes and is known as Paramatma. He is present even within the atoms. Anyone who knows these three Visnus can be liberated from material entanglement.
Bhagavad Gita: Constitutional position of God [Knowledge of the Absolute (Text 4 Chapter 7)]