The discussions Avicenna

We may realize ourselves and not realize anything of our internal organs, for these are not the same as those. It is not permissible for the perceived to be anything of our external organs, or their parts, or the entire body, otherwise if that organ is made clear and invalidated, the sense of self would be invalidated or diminished, and that is not the case. For the perceived of the self, when some organs are absent and when all are present, is the same and does not differ.