"In case you haven't noticed, you have a mental dialogue going on inside your head that never stops. It just keeps going and going. Have you ever wondered why it talks in there? How does it decide what to say and when to say it? How much of what it says turns out to be true? How much of what it says is even important? And if right now you are hearing, "I don't know what you're talking about. I don't have any voice inside my head!" - that's the voice we're talking about."
- Michael A. Singer
The Untethered Soul