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

The multiplicity of facts and writings is become so great that every thing must soon be reduced to extracts and dictionaries. – Voltaire

Collections of gnomes, adages, sayings, and parables have been made from times immemorial in all countries and in all languages possessing some kind of literature. – E.H. Michelsen, A Manual of Quotations from the Ancient, Modern, and Oriental La