Heaven and earth share the same source.
"Heaven always exists, not for the existence of Yao, not for the death of Jie" comes from Xunzi's theory of heaven, and the original text is as follows:
Nature is the real law. Governance is good, governance is chaotic.
translate
Heaven (the law of nature) is eternal. It does not exist because of Yao (such a kind monarch), nor does it disappear because of Jie (such a cruel monarch). Adapt to it according to the law of governing it, and you will get good luck; If you adapt to it in disorder, you will suffer a fierce disaster.
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In Xunzi, Xun Kuang's materialistic view of nature is embodied, mainly in Tian Lun and Fei Xiang. This sentence completely denies the saying that heaven has a will and distinguishes the objective laws of nature from the development of human society. This is Xun Kuang's view that "Heaven and Man are separated".