text: Ananda Coomaraswamy suggested that Devas and Asuras can be best understood as being similar in concept to the Twelve Olympians and the Titans of Greek mythology; both are powerful but have different orientations and inclinations, the Devas representing the powers of Light and the Asuras representing the powers of Darkness in Hindu mythology. According to Coomaraswamy, "the Titan [Asura] is potentially an Angel [Deva], the Angel still by nature a Titan" in Hinduism.
  Indo-Aryan context
  In the 19th century, Haug pioneered the idea that the term Asura is linguistically related to the Ahuras of Indo-Aryan people and pre-Zoroastrianism era. In both religions, Ahura of pre-Zoroastrianism (Asura of Indian religions), Vouruna (Varuna) and Daeva (Deva) are found, but their roles are on opposite sides. That is, Ahura evolves to represent the good in pre-Zoroastrianism, while Asura evolves to represent the bad in Vedic religion, while Daeva evolves to represent the bad in pre-Zoroastrianism, while Deva evolves to represent the good in Vedic religion. This contrasting roles have led some scholars to deduce that there may have been wars in proto-Indo-European communities, and their gods and demons evolved to reflect their differences. This idea was thoroughly researched and reviewed by Peter von Bradke in 1885.