As the Spanish proverb says "He who would bring home the wealth of the Indies must carry the wealth of the Indies with him." So it is in traveling: a man must carry knowledge with him if he would bring home knowledge.
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About Samuel Johnson
Samuel Johnson was a 18th-century English writer and lexicographer. Samuel Johnson, often called Dr Johnson, was an English writer who made lasting contributions as a poet, playwright, essayist, moralist, literary critic, sermonist, biographer, editor, and lexicographer. The Oxford Dictionary of National Biography calls him "arguably the most distinguished man of letters in English history". Read more on Wikipedia →