Abstract

From among the arguments adduced for God's Existence, the ontological argument is of prime importance. Since long ago, prominent western philosophers have written important papers and books for or against this argument. Leibniz, who is one of the supporters of the ontological argument, claims that through removing the defect of the ontological argument posed by Anselm and Descartes, it can be transformed into an argument comparable to mathematical ones in terms of certainty and conclusiveness.In this paper, in addition to the history of the ontological argument, we will explain Leibniz's view concerning its defect and inquire into his solutions in this regard.