On the Fourfold Root of the Principle of Sufficient Reason

Editor’s Preface to the Fourth Edition

The present Fourth Edition is of the same content as the Third; therefore it contains the same corrections and additions which I had already inserted in the Third Edition from Schopenhauer’s own interleaved copy of this work.

Julius Frauenstädt.

Berlin, September, 1877.

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ON THE FOURFOLD ROOT
OF THE
PRINCIPLE OF SUFFICIENT REASON.