There was something undifferentiated and yet complete, Which existed before heaven and earth. Soundless and formless, it depends on nothing and does not change. It operates everywhere and is free from danger. It may be considered the mother of the universe. I do not know its name; I call it Tao. If forced to give it a name, I shall call it Great. Now being great means functioning everywhere. Functioning everywhere means far-reaching. Being far-reaching means returning to the original point. Therefore Tao is great. Heaven is great. Earth is great. And the king (1), is also great. There are four great things in the universe, and the king is one of them. Man models himself after Earth. Earth models itself after Heaven. Heaven models itself after Tao. And Tao models itself after Nature.

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