I think this is perhaps the most fundamental question. If I am quiet as you suggest, I see that I am not this, not that but that I am identified with it. If I say I am the inner part of my body, a role such as a father, a blogger, a worker - each one does not answer the question. Occasionally when I am quiet, a subtler sense of I arises which can see the other 'I's, yet the question still remains. So, I (whatever this is) do not know as well.