Abstract

Man cognizes existents through either acquired or presential knowledge. The former includes concept and judgment, and concept consists of sense perception, imagination, and reason. Having access to sensual and imaginative concepts about corporeal existents is possible for all human beings. However, some philosophers believe that most people cannot reach the level of rational concept.One cannot receive sensual imaginal knowledge from abstract existents. Therefore, the only possible concept of abstract existents, just for a few of them, is the rational concept. Man cannot perceive the objective disengagement of the soul through universal concepts.Philosophers such as Mulla Sadra who believe that acquired knowledge cannot help man to understand the reality of the soul, while presenting some arguments in order to demonstrate the immateriality of the soul, believe that they lead to certainty. Given the fact that arguments produce acquire knowledge, their purpose is to create rational certainty rather than one that can be attained through intuitive knowledge. The arguments adduced for the demonstration of the immateriality of the soul can be classified based on their principles.