That's a powerful idea and it actually goes deeper than you may think. We are divided even internally inside ourselves. There is reason to think that your internal rational decision-making processes consist of multiple sub-processes that combine and compare various points of view. Each sub-process has the same level of interaction with other sub-processes as you would have when speaking to another person. Your mental sub-processes may not even distinguish between thoughts and ideas coming from another part of your brain and coming from another person.