Part III

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In traveling, a man must carry knowledge with him,
if he would bring home knowledge.

- Samuel Johnson, quoted in Boswell's Life of Samuel Johnson, 1778

A man should keep his little brain attic stocked with all the
furniture that he is likely to use,
and the rest he can put away in the lumber-room of his library,
where he can get at it if he wants it.

- Sir Arthur Conan Doyle, "Five Orange Pips",
The Adventures of Sherlock Holmes, 1891