I take him [Beethoven] twice a week, Haydn four times, and Mozart every day. You will tell me that Beethoven is a Colossus who often gives you a dig in the ribs, whilst Mozart is always adorable; it is that the latter had the chance of going very young to Italy, at a time when they still sang well.
Alfred Christlieb Kalischer Beethoven und seine Zeitgenossen (1908) p. 83