Who we are I believe, correlates more with the state of stillness than it does with our intellectual thinking. Your ability to feel stillness, to just be with yourself, the world, nature, or with others, is a greater indication of your maturity and level of humanity.
Stillness is not reading a book while lying on a beach or watching TV numbed out on the couch. Stillness is being comfortable with silence and doing seemingly nothing in that moment for a period of time. Whether with yourself alone, or with another.
So in Body Psychotherapy and in fact with all the work done in a session with a client, once the initial talking is done and we move to deepening, there is a lot of stillness time. The stillness can be quiet or active, but there are few words if any, it is simply still. The thinking becomes less important and the attention moves to the body and the inner workings of the subconscious.
Stillness breathes in fresh air to a crowded over thinking, over worked mind and gives the body a chance to speak and heal itself in areas that had been locked and pushed away for far too long.
This is why Mediation is a good practice. To meditate you need to accept stillness.