Even Heaven and Earth cannot exist without the innate knowledge that is inherent in man. For at bottom Heaven, Earth, the myriad things, and man form one body. The point at which this unity manifests in its most refined and excellent form is the clear intelligence of the human mind. Wind, rain, dew, thunder, sun and moon, stars, animals and plants, mountains and rivers, earth and stones are essentially of one body with man. It is for this reason that such things as the grains and animals can nourish man and that such things as medicine and minerals can heal diseases. Since they share the same material force, they enter into one another."

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