Know thyself! This is the mantra, command, law of almost every person, philosophy, and religion. Everywhere you turn, you hear that the key to life is knowing yourself. Every person has a sense that human beings are in some way different from everything else. The questions ‘who am I and what I am here for?’ are central to so much of life. We are told, the most important question that you will ask in your life is: ‘Who am I?’ Know thyself!