Who said "Routine is the enemy of art; vigilance is its guardian."?

This quote is attributed to Pierre Boulez.

Routine is the enemy of art; vigilance is its guardian. - Pierre Boulez

"Routine is the enemy of art; vigilance is its guardian."

Pierre Boulez Creativity

Avant-Garde Composer Conductor French 1925–2016

"Music is the vehicle for human emotion. It has always been."

"Compose yourself, and the world will compose itself."

"The serial technique is not a philosophy but a method."

"I think music is the most beautiful of all the arts."

"When life gives you lemons, make something beautiful."

"Creativity knows no bounds."

"Creativity is the expression of the soul."

"I'm making this up as I go."