He that has a secret should not only hide it, but hide that he has it to hide.
Thomas Carlyle (1795-1881) Scottish essayist and historian
The French Revolution: A History, Part 2, Book 1, ch. 7 (2.1.7) (1837)
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Carlyle puts this in quotes, but he is again apparently quoting himself. He later used the phrase in his history of Friedrich II of Prussia (Frederick the Great).
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Don’t join the book burners. Don’t think you are going to conceal thoughts by concealing evidence that they ever existed. Don’t be afraid to go in your library and read every book, as long as that document does not offend your own ideas of decency. That should be the only censorship.