I can tell thee where that saying was born… – William Shakespeare, Twelfth Night [I, 5, Maria]

Nor must you find fault with me if I often give you what I have borrowed from my various reading, in the very words of the authors themselves. – Macrobius, translated from Latin

Quotation mistakes, inadvertency, expedition, and human lapses, may make not only moles but warts in learned authors… – Thomas Browne, Christian Morals, 1716 (Part the Second, sect. ii)

He repeated to himself an old French proverb that he had made up that morning. – F. Scott Fitzgerald