What could be closer to us than the air we breathe - air in lungs, right next to heart, etc.? Certainly not anything physical. Air is as close as you can get.
But what of love, things spiritual? Do these reside in some physical organ? Of course not. Here we get back to consciousness.
I think it is fascinating (and profound!) that Moses, when he asked God (with whom he was communing), Whom shall I say sent me? got the answer “I AM” sent you.
Is not “I am” closer to us than the air we breathe? From this we can be sure that this self-awareness does not reside in the physical body. From yesterday’s post: the kingdom of God is within you! That is a pretty big concept, and it surely could not fit into a physical body!
The more we turn away from the physical and turn to consciousness, paying heed to it, addressing fears, resentments. selfishness, pride, etc. the more whole will be our being, including this physical body thing.
I know of no more useful “handbook” in this direction than “Science and Health with Key to the Scriptures” by Mary Baker Eddy: "Self-love is more opaque than a solid body. In patient obedience to a patient God, let us labor to dissolve with the universal solvent of Love the adamant of error, — self-will, self-justification, and self-love, — which wars against spirituality and is the law of sin and death."