Even as it is separating and categorizing the entire outer world, the interpreter also works to separate and categorize the inner world into the conflicting beliefs of a controller (present self) and something else to be controlled (future self), creating an inner conflict that cannot be resolved. We are the only species that we know of that can believe in ourselves, lie to ourselves, convince ourselves, love or hate ourselves, accept ourselves, push and even pull ourselves.
The interpreter refers to ourselves or our minds or our brains. Again, this is not straight-forward as that is the point of the book.
