"Our self image, strongly held, essentially determines what we become." - Maxwell Maltz
Who are you? You have a name. You have been given numbers to prove your identity. There are scores attached to those names and numbers that tell others about your credit and character. Most people have job titles and nicknames. While each of these tell something about who we are to other people, even collectively they don't tell us who we are. That is because each of these identifying factors are external.
