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"What cannot be seen is called evanescent; What cannot be heard is called rarefied; What cannot be touched is called minute. These three cannot be fathomed And so they are confused and looked upon as one. Its upper part is not dazzling; Its lower part is not obscure. Dimly visible, it cannot be named And returns to that which is without substance. This is called the shape that has no shape, The image that is without substance. This is called indistinct and shadowy. Go up to it and you will not see its head; Follow behind it and you will not see its rear. Hold fast to the way of antiquity In order to keep in control the realm of today. The ability to know the beginning of antiquity Is called the thread running through the way."