Great quotation collections glean the millennia, distill essences, and battle for bragging rights about who’s bigger, who’s smarter, who’s best. Who-knows-who-said-what has a market, a history, and a hall of fame. – Willis Goth Regier, Quotology, 2010

Not everything that can be extracted appears in anthologies of quotations, in commonplace books, or on the back of Celestial Seasonings boxes. Only certain sorts of extracts become quotations. – Gary Saul Morson, The Words of Others: From Quotations to Culture, 2011

That part of a work of one author found in another is not of itself piracy, or sufficient to support an action; a man may adopt part of the work of another; he may so make use of another’s labors for the promotion of science and the benefit of the public. – Lord Ellenborough, quoted in Bouvier’s Law Dictionary by John Bouvier, 8th