BG 7.4-6
Earth, water, fire, air, ether, Mind, and Reason also and Egoism—these are the eightfold division of My nature. This the inferior. Know My other nature, the higher, the life-element, O mighty-armed, by which the universe is upheld. Know this to be the womb of all beings. I am the source of the forthgoing of the whole universe and likewise the place of its dissolving.