In the Vedas, Indra is the greatest of gods, one who battles demons like Vritra, and releases the waters held by clouds. He is the patron of kings. Yet, in the Puranas, his role is reduced. He is the lord of Paradise (Swarga), leader of devas, who lives in celestial regions and enjoys worldly pleasures, but lacks wisdom. He needs the help of Vishnu to fight the demons (asuras) who lay siege to Paradise and declare war relentlessly. This shift in status indicates a shift from the older more materialistic Vedic way to the later Vedic (Upanishadic) way where greater value was placed on the mind
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