Aristotle opened a path to “existentialism” through criticizing Platonic “idealism”, which European philosophers were later to follow to develop their philosophic thoughts. Out of the same origin, “existentialism” and “idealism” were interlaced and interpermeated, both seeking the essence of things. Aristotle attempted to fit “existence” into domain of “knowledge” and regarded “category” as the “instrument” of existence. This correspondence of “instrument” to “category” contained “contradiction” in itself: its compatibility was obvious when the “instrument” that was compatible only to the domain of “knowledge” was applied in the “absolutepure” world. Aristotelian “existentialism” in the framework of “epistemology” reveals the metaphysical internal contradiction of European philosophy, namely, an unsurmountable contradiction whenever existence as the subject is introduced into the frame of “experiencephenomenon”. Aristotelian system of logic was to set rules and fields for every “conceptcategory” to avoid “mutual conflict” for “knowledgescience” was a reasonable, harmonious and interconnected. In this system the concept of “purpose” links “sein” up to “every dasein”.

Greek philosophy; Aristotle; Plato; “experience”