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)

A good conversationalist is not one who remembers what was said, but says what someone wants to remember. – John Mason Brown

…though many a gatherer has carried his basket through these diamond districts of the mind… – William Rounseville Alger, “The Utility and the Futility of Aphorisms,” The Atla

But I have long thought that if you knew a column of advertisements by heart, you could achieve unexpected felicities with them. You can get a happy quotation anywhere if you have the eye. – Oliver Wendell Holmes, Jr., 1923, quoted in Holmes-Laski Letters: The Correspond