The very fact that it cannot see itself makes it the real self. Besides, all things that we can point out, which are intelligible to ourselves, we call "mine"; and so we call our body "my" body. Naturally the body is not the self, but as man does not know himself he thinks it is. If an actor were to play on the stage with a mask on, those who saw him would recognize the mask, but they would not know what was behind it. So it is with the soul.