Abstract

Pointing to the origination of the concept of "simplicity", conveying concepts such as "infinity" and "universality" in Islamic philosophy as well as Western philosophy in the 17. Century, the author goes to elucidate the similarity between the meanings of "the simple existence", "the absolute existence" and "infinite existence" in the doctrines of Mulla Sadra, Spinoza, and Leibniz. He believes that from the rule of "the simplest reality..." of Mulla Sadra to the Spinoza's absolute existence, which are incorporated in Leibniz's philosophy, the same intellectual movement can be seen! While describing the doctrines of these philosophers on the rule of "the simplest reality..." he mentions the monad 's "singularity in kind" and "plurality in reference" in Leibniz's doctrine and then adds: this discrepancy between the doctrines of Mulla Sadra and Leibniz on "pure simple" or as Leibniz puts it "existence", that according to him has no impossible predicates and attributes, has paved the way for plurals in Leibniz's philosophy, leading finally to what Mulla Sadra calls" primacy of quiddity"