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"Looking at it, you do not see it, you call it Invisible. Listening to it, you do not hear it, you call it Inaudible. Touching it, you do not grasp it, you call it Intangible. These three cannot be described, but they blend, and are One. Above, it is not bright; Below, it is not dim; Unceasingly, unceasingly, It cannot be called by a Name, It enters into Form, and returns into Spirit. That is why it is called Spiritual Form of Form, Spiritual Image of Image. That is why it is called vague and indeterminate. Meet it, you cannot see its beginning; Follow it, and you cannot see its end. Consider the Tao of Old in order to arrange affairs of Now. To be able to know the Life-Spring of Old is to give expression to the Thread of the Tao."