[W]hen I hear or read a good line I can hardly wait to tell it to somebody else… – Robert Byrne, The Third and Possibly the Best 637 Best Things Anybody Ever Said,

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

Most of the classical citations you shall hear or read in the current journals or speeches were not drawn from the originals, but from previous quotations in English books… – Ralph Waldo Emerson, “Quotation and Originality,” Letters and Social Aims, 1876