Mixing one's wines may be a mistake, but old and new wisdom mix admirably.
Source: The Singer, in The Caucasian Chalk Circle, Prologue, 1944.
-- Bertolt Brecht, (Feb 10 1898-1956), German dramatist, poet; He was the foremost German playwright of 20th century; best known for Threepenny Opera, 1928 (in collaboration with Kurt Weill).