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

Short sentences drawn from long experience. – Miguel de Cervantes

He who trains his tongue to quote the learned sages will be known, far and wide, as a smart-ass. – Howard Kandel, The Power of Positive Pessimism: Proverbs for Our Times, 1964

[D]ifferent people have different quotational gravity. – Willis Goth Regier, Quotology, 2010