Islamic philosophy is a collection of existence and its related issues, the general commandments of existence in theology in the general sense, the verification of the obligatory, obligatory characteristics and obligatory deeds, in particular. Avicenna is one of the most important Islamic philosophers who made a major contribution to consolidation, completion and innovations of this special ideological tradition. In logic and philosophy he has his specific opinions and innovations. This paper seeks to present Avicenna’s philosophic innovations and make a distinction between his viewpoints and Greek philosophers’. The researcher is to make it clear that Islamic philosophy has not been a sole follower of the Geek philosophy. However, Muslim philosophers especially Avicenna valued the Greek philosophy, particularly Aristotelian philosophy. They propounded new theories and criticized and completed previous philosophical subjects. This paper also discusses the differences of Avicenna’s viewpoints in proving the obligation of knowledge, the completeness, and causality, etc.
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