Tao -The Way to self-knowledge is also the Way to avoid the self annihilation of our present civilization on Earth and the path to realize harmony within us and with our fellow human beings.Tao is the unmanifest potentiality from which all manifestations proceed and also our true identity; Taoism acknowledges that the cyclical changes in the human body and the changing aspects of nature are intimately related. Through careful observation of the natural world and insights gained in deep meditative trance,the early Chinese sages developed the concept of yin-yang, opposing forces that complement each other and, through their interaction, give rise to the rest of the phenomenal world, or what the ancients called "the ten thousand things." Likewise, Taoists relate the microcosm of the human body to the macrocosm of the world (earth, heavens, and underworld).