Extreme dualism of the mind and body was occurred in Descartes philosophy. He failed to solve the problem and, professing his failing, preferred to leave the problem unresolved. Malebranche, however, relying on theological foundations and limiting causality to God, sought to solve the problem. He knew their relationship to be an action of God. Spinoza, for the solution, reduced the multiplicities to unity and knew the mind and the body as two states of a single substance. And Leibniz believed in multiplicity of monads in the body and the soul. For him, mental monads are in full and lasting harmony with those of the body. None of their solutions, however, have been accepted. Sadra, on the contrary, has presented a reasonable answer to the problem as he knows the mind to be a material being at the beginning. It changes into an immaterial being by an essential and gradual departure.