As far as the execution is concerned ... the most frequent and most serious mistake is to follow the music instead of preceding it.
Without order there can be no inner satisfaction. Without inner satisfaction there can be no freedom. Without freedom there is no joy.
You should never listen to someone practice. That is their work and theirs alone.
Without discipline, there can be no freedom.
Art is not emotion. Art is the medium in which emotion is expressed.
Never forget that your days are blessed. You may know how to profit by them, or you may not, but they are blesses.