All quotation dictionaries stand on the shoulders of their predecessors, which must be consulted as part of the effort to make sure that no famous quotations are missed. – Fred R. Shapiro, The Yale Book of Quotations, 2006 (Acknowledgements)

Quotation mistakes, inadvertency, expedition, and human lapses, may make not only moles but warts in learned authors… – Thomas Browne, Christian Morals, 1716 (Part the Second, sect. ii)

I would fain coin wisdom,—mould it, I mean, into maxims, proverbs, sentences, that can easily be retained and transmitted. Would that I could denounce and banish from the language of men—as base money—the words by which they cheat and are cheated! – Joseph Joubert, translated from French