 Because movement is only modally distinguished from the body, it cannot be separated from the moved body and it cannot be transferred from one body to another. However, because the force of movement can be separated from a body, it should be really distinguished from the body. Now, because the force of movement is really distinguished from the moved body, this force is not corporeal and does not pertain to such a body. In the same way in which Descartes used the real distinction between thought and extension to prove that the nature of thought has nothing to do with extension, La Forge argues that the real distinction between movement and force of movement entails that the force of movement cannot have anything extended in its own nature. Therefore, a body cannot have the force to move itself and, thus, it cannot have the force to move another body (because the force of motion is not in itself something bodily at all). 