Zoroastrianism was a classical Persian belief system founded by Zoroaster, who preached a message of moral reform during an age of materialism. The religion's primary sacred text is the Avesta, which includes hymns and prayers written by Zoroaster. Zoroastrianism believes in monotheism and supremacy of the wise lord Ahura Mazda over all other gods. It also believes in dualism where the universe and human soul are a battlefield between Ahura Mazda and the evil spirit Angra Mainyu, and humans must choose which side they support. The religion influenced concepts in later faiths such as Judaism, Christianity, and Islam.