Besides, it happens (how, I cannot tell) that an idea launched like a javelin in proverbial form strikes with sharper point on the hearer’s mind and leaves implanted barbs for meditation… – Desiderius Erasmus, Adages

Don’t you love quotations? I am immensely fond of them; a certain proof of erudition…. [I]f you should happen to write an insipid poem… send it to me, and my fiat shall crown you with immortality. – Frances Brooke, Lady Julia Mandeville , 1763

We prefer to think that the absence of inverted commas guarantees the originality of a thought, whereas it may be merely that the utterer has forgotten its source. – Clifton Fadiman, The American Treasury, 1455-1955, 1955

Every book is a quotation; and every house is a quotation out of all forests and mines and stone quarries; and every man is a quotation from all his ancestors. – Ralph Waldo Emerson, “Plato; Or, The Philosopher”