In Mulla Sadra’s philosophy, after the soul is proved, it is argued that it must be abstract and immaterial. However, considering the abstract soul, it should be answered whether Mulla Sadra is dualistic or monistic? In this study, based on Sadra’s principles, it will become clear that the human being is a single reality from sperm to his last stages of abstractness, and various respects and stages is abstracted from it and then the concept of soul and body is obtained from those various respects and stages without being any exact and specific boundaries among them. The principle of substantial movement and essential evolution as well as existential unity enables Sadra to explain these concepts. He also uses the conceptual model of principle of the unity of matter and form (potentiality and actuality) and then considers the man as a reality that has two aspects of actuality and potentiality (soul and body).
)
