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The truth is, the science of Nature has been already too long made only a work of the brain and the fancy: It is now high time that it should return to the plainness and soundness of observations on material and obvious things.

Man is not the creature of circumstances; circumstances are the creatures of men.

天地雖然廣闊，但變化規(guī)律是相同的；萬物雖然繁多，但治理原則是一致的。