The Observer
Close your eyes. Watch your thoughts. You will see a thought pass by: "I am hungry." Then another: "This is boring." If you can watch these thoughts, then you are not the thoughts. You are the thing watching them.
This is the distinction between the Contents of Consciousness and Context of Consciousness. Most of us are lost in the content. We are the movie screen, confusing ourselves with the images projected upon it.
The Western Deficit
Western neuroscience struggles with this "Witness." We look for a center of the brain—a "seat of the soul"—and find none. The brain is decentralized. Yet, the feeling of being a unified Observer is undeniable.
Eastern traditions (Advaita Vedanta, Zen) solved this by positing that the Observer is not a "thing" but a "field." It is empty of content, yet full of awareness.
Metacognition
Scientifically, we call this Metacognition—thinking about thinking. It originates in the Prefrontal Cortex. It is the ability to step out of the river of impulse and stand on the bank.
The Inheritance of Perspective
Your greatest power is the half-second between an impulse and an action. In that gap lives the Observer. If you can widen that gap, you are free. If you close it, you are a machine.
Cultivate the Witness. It is the only part of you that cannot be broken.