Ash'arism is a theological school within Sunni Islam that emphasizes divine omnipotence and the limits of human reason, advocating for a balance between reason and revelation. Founded by Abu al-Hasan al-Ash'ari in the 10th century, it became the dominant theological school in Sunni Islam, countering the rationalist Mu'tazilite school by asserting that God's attributes are beyond human comprehension.