Mulla Sadra, according to his spiritual four journeys, pictures human being as his existence being in motion and becoming, so he actualizes a new level of existence every moment and becomes identified with it. This type of being has created deep relationships between human being and the world. This paper seeks to clarify these relationships. In this regard, we first explain the concept of substantial motion which involves the entire material entities including human being. After that we focus on the existence of human being as a level of indeterminate being and try to make clear his position in the world. What will be in final stage is a traveler who is traveling in oneself and at the same time, traveling in the levels of being, and if his journey in the middle of the self is accompanied with the hint by observing his sights of existence, one retrieves the levels of being because they are the same. Certainly, what moves us forward in the path is only the observation of human being in the mirror of existence.