 It is believed that Llull's inspiration for the "Ars magna" came from observing Arab astrologers use a device called a zairja.The "Art" was intended as a debating tool for winning Muslims to the Christian faith through logic and reason.Through his detailed analytical efforts, Llull built an in-depth theosophic reference by which a reader could enter any argument or question (necessarily reduced to Christian beliefs, which Llull identified as being held in common with other monotheistic religions).