http://book.klll.cc/ebooks/subject/29495.opds 2025-08-06T15:06:49Z Books about Sufficient reason (sorted by popularity) Free eBooks since 1971. Project Gutenberg https://book.klll.cc webmaster@gutenberg.org https://book.klll.cc/gutenberg/favicon.ico 25 1 2025-08-06T15:06:49Z https://book.klll.cc/ebooks/50966.opds On the Fourfold Root of the Principle of Sufficient Reason, and On the Will in Nature: Two Essays (revised edition) Arthur Schopenhauer