The little passenger behind your face is not real
Sam Harris argues the self is what thinking feels like when you forget you are doing it.

Andrew Huberman · Essentials: Using Meditation to Focus, View Consciousness & Expand Your Mind | Dr. Sam HarrisAsked what the self actually is, Sam Harris, a neuroscientist and longtime meditation teacher, said the word is used in so many ways that it confuses the search. The part he cares about, the part meditation is aimed at, is the familiar feeling that there is someone in here having all of this.
Most people, he said, do not experience themselves as one with what is happening through them. They feel like a passenger inside the body, stationed somewhere behind the face as a small locus of awareness, thought, and intention. The world is out there, the body is an object in that world, and you are on the edge of it all, taking it in from the side.
That arrangement feels obvious, but Harris argues it does not exist as it seems. Harris described the illusion as "a subject interior to experience in addition to experience."
What creates that passenger, in his account, is unnoticed thinking. People are covertly talking to themselves almost all the time, plus picturing things and generating what he calls white noise in the mind. Because that chatter feels like me rather than something appearing in consciousness, it manufactures the sense of someone doing the thinking.
Harris puts it this way: “The self is what it feels like to be thinking without knowing that you’re thinking.” To notice the chatter as chatter, he says, is to begin to see that the passenger was never there, and that discovery brings a distinct kind of psychological freedom.
Questions people ask
If there is no passenger self, who is noticing the thoughts?
No one separate is watching from a control room. In this view, awareness itself notices sounds, sensations, and thoughts as they appear, without an extra observer behind it. Meditation trains people to rest as that open awareness rather than as a commentator on it.
Does seeing the self as an illusion mean I should have low self-esteem or no identity?
No. Harris is not talking about your biography, personality, or self-confidence. He means the moment to moment feeling of being a separate rider inside the head. You still have a body, memories, and responsibilities, but they do not require that extra passenger.
Can anyone actually stop the inner chatter?
Not by force, and not for long at first. Research on mind wandering finds that people slip into task unrelated thought very frequently, often without noticing. Practices like mindfulness do not erase thought so much as help people recognize a thought as a thought sooner, so it has less pull.