"The Tao that can be expressed is not the eternal Tao; The name that can be defined is not the unchanging name. Non-existence is called the antecedent of heaven and earth; Existence is the mother of all things. From eternal non-existence, therefore, we serenely observe the mysterious beginning of the Universe; From eternal existence we clearly see the apparent distinctions. These two are the same in source and become different when manifested. This sameness is called profundity. Infinite profundity is the gate whence comes the beginning of all parts of the Universe."