A Comparative Study of Human Fluidity, Sayyāliyat-i Insān, in Mulla Sadra's Substantial Movement of the Soul and the Forms, aṭwār, of Dasein in Heidegger's Thought

Substantial Movement is regarded as one of the most important topics in Sadra's wisdom. Based on the gradational state of existence, tashkīk-i wujūd, the occurrence of a substantial motion in an intensified manner is a possible, but an actualized event. Explaining this theory, on which human being would be of a fluid existence, illuminates one of the most strategic issues about the human soul. On the other hand, Dasein, as a central issue in Heidegger's thought, is not a fixed fact; it has different forms and dimensions. Considering the position of Sadra's wisdom and Heidegger's thought, a comparison between human fluidity in the theory of Sadra's substantial motion and Dasein's theory in Heidegger's view can clarify the hidden angles and more existential dimensions of human being. Accordingly, in the present article, in order to understand how human fluidity is, the six dimensions of the movement of the soul's essence from Sadra's point of view are described at first and then, the forms of Dasein from Heidegger's point of view are explained; in this way, the basis for comparing these two views is provided. The intellectual space of these two philosophers expresses their different principles. However, in some dimensions of motion including distance, commonalities can be found between the two philosophers. Of course, there are many differences between these two thinkers about man and his possible paths in life