Knowledge is that possession that no misfortune can destroy no authority can revoke and no enemy can control. This makes knowledge the greatest of all freedoms.
Learning is acquired by reading books but the much more necessary learning the knowledge of the world is only to be acquired by reading men and studying all the various facets of them.
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Every man gets a narrower and narrower field of knowledge in which he must be an expert in order to compete with other people. The specialist knows more and more about less and less and finally knows everything about nothing.
