I cannot live with myself any longer." This was the thought that kept repeating itself in my mind. Then suddenly I became aware of what a peculiar thought it was. "Am I one or two? If I cannot live with myself, there must be two of me: the ‘I' and the ‘self' that ‘I' cannot live with." "Maybe," I thought, "only one of them is real.

Eckhart Tolle

from The Power of Now: A Guide to Spiritual Enlightenment