knowledge: the activating agent of spirit, to which it is roughly equivalent, supplying its creative energy.
perception: the agent of choice; we are free to believe that our minds can be separated or split off from the Mind of God (wrong-mindedness), or that they can be returned to it (right-mindedness); thus, the split mind can be understood as having three parts: the wrong mind, the right mind, and the part of the mind (decision maker) that chooses between them; not to be confused with the brain, which is a physical organ and thus an aspect of our bodily self.
see: Mind of God