We prefer to think that the absence of inverted commas guarantees the originality of a thought, whereas it may be merely that the utterer has forgotten its source. – Clifton Fadiman, The American Treasury, 1455-1955, 1955

It is a good thing for an uneducated man to read books of quotations. Bartletts Familiar Quotations is an admirable work, and I studied it intently. The quotations when engraved upon the memory give you good thoughts. They also make you anxious to read the authors and look for more. – Sir Winston Churchill

In quoting others we cite ourselves. – Julio Cortázar (1914–1984), Around the Day in Eighty Worlds