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On the Fourfold Root of the Principle of Sufficient...

§ 5. The Principle itself.

Project Gutenberg EPUB3 edition Schopenhauer, Arthur and Hillebrand, Karl, Mme.
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We purpose showing further on that the Principle of Sufficient Reason is an expression common to several à priori notions. Meanwhile, it must be stated under some formula or other. I choose Wolf's as being the most comprehensive: Nihil est sine ratione cur potius sit, quam non sit. Nothing is without a reason for its being.[15]

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On the Fourfold Root of the Principle of Sufficient Reason, and On the Will in Nature: Two Essays (revised edition), Project Gutenberg eBook #50966

§ 4. Importance of the Principle of Sufficient Reason. § 6. First Statement of the Principle and Distinction between Two of its Meanings.