I fancy mankind may come, in time, to write all aphoristically, except in narrative; grow weary of preparation, and connection, and illustration, and all those arts by which a big book is made. – Samuel Johnson, quoted in The Journal of a Tour to the Hebrides, with Samuel Joh

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

It sometimes happens at the end of a dinner, when jokes and walnuts are cracked together, that the paternity of some trite quotation is put in question, and at once the wit of the whole company is set wool-gathering. – Frederic Swartwout Cozzens, “Phrases and Filberts,” Sayings, Wise and Otherwise