There are two great epics in Hinduism, which are very ancient. They are the Ramayana and the Mahabharata. They embody the manners and customs, the state of society, civilisation etc., of the ancient Indians.
Understanding human nature is the highest knowledge, and only by knowing it can we know God. It is also a fact that the knowledge of God is the highest knowledge, and only by knowing God can we understand human nature.
-Swami Vivekananda