"I have no doubt that I shall succeed."

"She will never learn the most necessary, most difficult and principal thing in music, that is time, because from childhood she has designedly cultivated the habit of ignoring the beat."

"Constanze is not ugly, but anything but beautiful; all her beauty consists of two little black eyes and a handsome figure."

"I never write anything without having thought it over carefully."

"What's even worse than a flute? - Two flutes!"