" (It is suggested that while the Vedic era saw only the worship of a formless and imageless God, the conduct of rituals and the propitiation of the river and mountain and tree gods of local tribes, all of which were ‘portable’ and not confined to a fixed spot, it was the arrival of the Greeks under Alexander in the fourth century BCE that brought into India the idea of permanent temples enshrining stone images of heroes and gods.) Again, while the Hinduism of the Vedas emerged from mantras and rituals, including elaborate sacrifices, the Puranas promoted their values entirely on the basis of myths and stories. By developing the concept of the saguna Brahman to go with the exalted idea of the nirguna Brahman, the Puranic faith integrated the Vedic religion into the daily worship of ordinary people. Using the seductive power of maya (illusion), the nirguna Brahman of the Vedas took the form of saguna Brahman or Ishvara, the creator of prakriti, the natural world and the God or Bhagavan of all human beings. "

― Shashi Tharoor , Why I am a Hindu