Discursive Theology Volume 1- Dr Ali Rabbani GulpayganiIslamic theology is nourished by two sources, viz. reason (aql) and revelation (wayi). Firstly, by citing axiomatic and definitive principles, reason proves the existence, knowledge, power, and wisdom of God, and on the basis of these rational theological doctrines, it also establishes the necessity for revelation and the infallibility of the prophets. And through revelation and prophethood (nubuwwah), it recognizes anew all the spiritual doctrines.