Naturally, it could be our subconscious talking to us in the guise of a wise old friend. The objection to that may be that this voice sometimes tells us the answer to problems and questions which have been tormenting us, with a wisdom superior to anything which we have associated with our own intelligence or thinking process.Of course it's part of your thinking process and intelligence. OTherwise, you are back into the realm of invisible friends and Santa. At that point, you may as well seek out a guru...
