Michael A. Singer's The Untethered Soul opens with a question that sounds simple and turns out to be genuinely disorienting once you sit with it: "Who are you?" Not your name. Not your job, your history, your relationships. Not even the thoughts running through your mind right now. Singer's answer — drawn from decades of meditation practice, Yoga philosophy, Buddhist teaching, and Christian mysticism — is that you are the awareness behind all of those things. You are the one who is watching. Eve...