Those who have mastered etiquette, who are entirely, impeccably right, would seem to arrive at a point of exquisite dullness.
Source: Mrs. Post Enlarges on Etiquette, in The New Yorker, 31 Dec 1927.
-- Dorothy Parker, (Aug 22 1893-1967), US author, poet, journalist, humorist; She was the celebrated caustic wit of the 1920s; wrote Enough Rope, 1926 and The Little Hours, 1944.