" I only know myself as a human entity, the scene, so to speak, of thoughts and affections, and am sensible of a certain doubleness by which I can stand as remote from myself as from another. However intense my experience, I am conscious of the presence and criticism of a part of me which, as it were, is not a part of me, but spectator, sharing no experience, but taking note of it, and that is no more I than it is you. "
― Henry David Thoreau , The Journal, 1837-1861