Is freedom a thought, an idea, a concept? Is love a subject of the brain? All that the brain can have is thoughts, ideas, concepts. Is love a thought, an idea, a concept? If you are saying this, then you must be living a loveless life.
How is it so that you say that you have never known anything apart from the brain? You surely have. Even as I speak to you right now, the brain is busy comprehending and analyzing what I am saying. But can the brain understand? And have you never known understanding? And if you have ever known understanding, how do you say that you are nothing but the brain?
Even this moment is sufficient to prove that you are not the brain.