One of the important pillars of transcendental wisdom, which plays an unparalleled role in Mulla Sadra's philosophical system, is essential movement. Without a doubt, essential movement is possible only by assuming the originality of existence, and essence itself is not susceptible to movement or doubt; therefore, Islamic sages have considered doubt and, consequently, movement in essence to be impossible. However, it seems that this issue, It depends entirely on our interpretation of the originality of existence and the validity of essence; that is, if the validity of essence is understood to mean "subjectivity and lack of externality", then there is no possibility of doubt and movement in essence. However, if the meaning of validity is that "essence does not have realization through pleasures and has realization incidentally"As Mukhtar's view is, in this case, both doubt in the essence makes sense and movement in the essence will be provable. The present research aims to use a descriptive analytical method and rely on the principles of Sadr al-Mutalahin to "prove the incidental movement in the essence" in accordance with a specific interpretation of validity.