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.[1]: 3–8 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.