Negation of Boundary (Being Borderless) between the Immaterial and the Material in Ṣadrā's Thought

One of the important philosophical issues is the discussion of the “immaterial and material” (existence) being. Providing a precise definition of “immaterial” and “material”, proving their existence, expressing their species, and the relationship between immaterial and material are among the important concerns of philosophers. It has been tried in this article to define and analyze the quiddity and characteristics of immaterial and material beings and also has been tried to examine Mullā Ṣadrā's special opinion precisely on the manner of immaterial and material relation. The author by referring (citing) the doctrine of existential separation in the transcendent theosophy has tried to prove that in Ṣadrā's thought, it is not possible and should not be believed in a clear and definite boundary like the peripatetic, between the immaterial and the material, because the immaterial and the material and the rules and characteristics of existence each of them have a return to the degree of intensity and weakness in the fact of the unity of existence, and as in the system of existential separation, existential discontinuity that is not assumed, neither can be believed a definite and bold existential boundary between the immaterial and the material despite the essential distinction.