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)

One man’s wit, and all men’s wisdom. – John Russell, definition of a proverb

I am wonderfully pleased when I meet with any passage in an old Greek or Latin author, that is not blown upon, and which I have never met with in any quotation. – Joseph Addison, Spectator, No.464

Only roam on, therefore, all fearless, in the many garden of romantic chivalrous poesy, which drawing within its circle all that is glorious and inspiring, gave itself but little concern as to where its flowers originally grew. – C.O. Müller (Karl Otfried Müller), Introduction to a Scientific System