I, from towel, refers to sign front, banner name. From xu, hieroglyphic board axe, to take the meaning of beating the world, sitting in the world, referring to the guarding of success, the guardian of success. I, in ancient Chinese, is mainly used in a generalized sense, referring to us, all of us, including each of us. I, as opposed to me. I, mainly used in a specific sense, refers exclusively to myself. I, have to be righteous under the banner, with me and you, forming us, can be united as one, in order to be invincible, can be a big banner, is the real king. In Lao Tzu's time, people had already realized that I, each one of us, has three identities, with the difference between the Self, the Ego, and the Spiritual Self. The Self, the physical me, lives only once and comes and goes. The ego, which is the me in the heart, can't help what it wants to do. Spiritual self, refers to the me in the heart of others, not to be forgotten, though dead, still alive, not to be remembered, though alive, still dead.