The absolute is impersonal. The supreme Self is beyond name and form, Beyond the senses, inexhaustible, Without beginning, without end, Beyond time and space, and causality, Eternal, immutable. The most famous saying from the Chandogya Upanisad has come to be almost creedal. It is spoken by Uddalaka who is teaching his precocious son, Shvetaketu, about ultimate reality. According to Uddalaka, our preception of the plurality of objects is an illusion of speech.
Birth is followed by change and decay and death and rebirth.
The self, atman, is reborn again and again until it awakens to its own ignorance and becomes conscious of its true Self, that Atman is Brahman. Everything is in a constant state of change or flux, including the gods. Change is not capricious or randon. It follows the law of Karma. The world is the wheel of God, Turning round and round with all living creatures upon its rim.