Saadiya's Main Philosophical Treatise

Saadiya's main philosophical treatise should be called Kitab Al-Ahamah-Nat Wal-Etikadat, the Book of Beliefs and Doctrine. It may seem amazing that these Jewish philosophers should have such intellectual affinity with Islamic theologians but Saadiya was not signaling his allegiance to the Moatazalites as such. In this treatise he does not just set out the fundamental beliefs of Judaism, he explains how these beliefs are in accordance with reason.