A jackass has that kind of strength, and puts it to a useful purpose, and is valuable to the world because he is a jackass; but anobleman is not valuable because he is a jackass. It is a mixture that is always ineffectual, and should never have been attempted in the first place. And yet, once you start a mistake, the trouble is done and you never know what is going to come of it.

A Connecticut Yankee in King Arthur's Court (ed. Createspace Independent Pub, 1889)