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Now it is established in the sciences that no knowledge is acquired save through the study of its causes and beginnings, if it has had causes and beginnings; nor completed except by knowledge of its accidents and accompanying essentials.

现在在科学中已经确立了这样一种观点:如果有原因和开始,那么除了通过研究其原因和开始之外,就不可能获得任何知识;除非知道它的事故和伴随的要点,否则它不会完成。

— Avicenna 阿维森纳

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