See if you can catch, that is to say, notice, the voice in the head, perhaps in the very moment it complains about something, and recognize it for what it is: the voice of the ego, no more than a conditioned mind-pattern, a thought. Whenever you notice that voice, you will also realize that you are not the voice, but the one who is aware of it. In fact, you are the awareness that is aware of the voice. In the background, there is the awareness. In the foreground, there is the voice, the thinker. In this way you are becoming free of the ego, free of the unobserved mind. The moment you become aware of the ego in you, it is strictly speaking no longer the ego, but just an old, conditioned mind-pattern. Ego implies unawareness. Awareness and ego cannot coexist. The old mind-pattern or mental habit may still survive and reoccur for a while because it has the momentum of thousands of years of collective human unconsciousness behind it, but every time it is recognized, it is weakened.
— Eckhart Tolle