“As the biggest library if it is in disorder is not as useful as a small but well-arranged one, so you may accumulate a vast amount of knowledge but it will be of far less value to you than a much smaller amount if you have not thought it over for yourself; because only through ordering what you know by comparing every truth with every other truth can you take complete possession of your knowledge and get it into your power. You can think about only what you know, so you ought to learn something; on the other hand, you can know only what you have thought about.”

— Arthur Schopenhauer , book Parerga and Paralipomena

Vol. 2, Ch. 22, § 257 "On Thinking for Yourself" as translated in Essays and Aphorisms(1970) as translated by R. J. Hollingdale
Variant translation: Just as the largest library, badly arranged, is not so useful as a very moderate one that is well arranged, so the greatest amount of knowledge, if not elaborated by our own thoughts, is worth much less than a far smaller volume that has been abundantly and repeatedly thought over.
Parerga and Paralipomena (1851), Counsels and Maxims

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Arthur Schopenhauer 261

German philosopher 1788–1860

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Arthur Schopenhauer 261

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