You can't teach an old dogma new tricks.
Source: In The Algonquin Wits, ed. by Robert E. Drennan, 1968.
-- 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.