Editing Early Islamic philosophy (section)

===Judeo-Islamic philosophy===
{{Main|Judeo-Islamic philosophies (800–1400)}}
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The oldest Jewish religio-philosophical work preserved is that of [[Saadia Gaon]] (892–942), ''[[Emunoth ve-Deoth|Emunot ve-Deot]]'', "The Book of Beliefs and Opinions". In this work Saadia treats the questions that interested the Mutakallamin, such as the creation of matter, the unity of God, the divine attributes, the soul, etc. Saadia criticizes other philosophers severely. For Saadia there was no problem as to creation: God created the world ''[[ex nihilo]]'', just as the [[Bible]] attests; and he contests the theory of the Mutakallamin in reference to atoms, which theory, he declares, is just as contrary to reason and religion as the theory of the philosophers professing the eternity of matter.

To prove the unity of God, Saadia uses the demonstrations of the Mutakallamin. Only the attributes of essence (''sifat al-dhatia'') can be ascribed to God, but not the attributes of action (''sifat-al-fi'aliya''). The soul is a substance more delicate even than that of the [[celestial spheres]]. Here Saadia controverts the Mutakallamin, who considered the soul an "accident" '''arad'' (compare [[Guide for the Perplexed]] i. 74), and employs the following one of their premises to justify his position: "Only a substance can be the substratum of an accident" (that is, of a non-essential property of things). Saadia argues: "If the soul be an accident only, it can itself have no such accidents as wisdom, joy, love", etc. Saadia was thus in every way a supporter of the Kalam; and if at times he deviated from its doctrines, it was owing to his religious views; just as the Jewish and Muslim Peripatetics stopped short in their respective Aristotelianism whenever there was danger of wounding orthodox religion.