Indifference is commonly the mother of discretion.
(Philip Dormer Stanhope, 4th Earl Chesterfield (1694-1773), British statesman, man of letters. letter, Sept. 1749, The French Correspondence of the 4th Earl of Chesterfield, vol. I, p. 65, ed. Rex A. Barrell, trans. James Gray, Ottawa, Borealis Press (1980) I. 65.)
Oh, I've got the prettiest mother. I've got the nicest mother. That's what I tell everybody. I say I've got the sweetest mother in the world.
(John Lee Mahin (1902-1984), U.S. screenwriter, and novel by William March. Mervyn Le Roy. Rhoda (Patty McCormack), The Bad Seed, this is what Rhoda says to keep her mother from inquiring too closely into her activities (1956).
If you can think of a better category, you're welcome to change it.)