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

Ancient and modern languages teem with happily expressed sentiments of more or less force and beauty, sufficiently individualized and excellent to warrant their reproduction and classification. – Maturin M. Ballou, January 1886, preface to Edge-Tools of Speech

Patch grief with proverbs; make misfortune drunk… – William Shakespeare, Much Ado About Nothing, c.1598

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)