I come, and go, and come. When Righteousness
Krishna reveals that this teaching is ancient — he taught it to the sun god at the dawn of time. Arjuna asks how this is possible. Krishna reveals his divine nature: he is born by his own will, age after age, to restore dharma and protect the good.
The doctrine of the avatara: God incarnates whenever righteousness declines. Foundation of Hindu theology and Vaishnavism.