When a thing has been said and well said, have no scruple: take it and copy it. – Anatole France, “The Creed”

Mr. [Thomas] Gray the poet has often observed to me that if a man were to form a Book of what he had seen and heard himself it must in whatever hands prove a most useful and entertaining one. – Horace Walpole, quoted in Walpoliana, 1800

Next to the originator of a good sentence is the first quoter of it. Many will read the book before one thinks of quoting a passage. As soon as he has done this, that line will be quoted east and west. – Ralph Waldo Emerson, “Quotation and Originality,” Letters and Social Aims, 1876

I believe it was Gayelord Hauser, the nutritionist, who said that “you are what you eat,” but if you happen to be an intellectual, you are what you quote. – Joseph Epstein, “Quotatious,” A Line Out for a Walk: Familiar Essays, 1991