"There is no weak piece by Chopin. Still, his music is played so poorly so often, and that does not do him any good. The Sonata in B flat minor and the ballad in G minor are played much very often. It does not mean I wouldn’t play them, but I wouldn’t do it so much."
January 1, 1970
https://en.wikiquote.org/wiki/Fr%C3%A9d%C3%A9ric_Chopin