One needs only to study a certain positioning of the hand in relation to the keys to obtain with ease the most beautiful sounds, to know how to play long notes and short notes and to [attain] certain unlimited dexterity... A well formed technique, it seems to me, [is one] that can control and vary a beautiful sound quality.
As quoted in "Chopin: Pianist and Teacher as Seen by His Pupils" (1986) by Jean-Jacques Eigeldinger, Roy Howat, Naomi Shohet, and Krysia Osostowicz