Who said "A composer without doubt is a composer without depth."?

This quote is attributed to Pierre Boulez.

A composer without doubt is a composer without depth. - Pierre Boulez

"A composer without doubt is a composer without depth."

Pierre Boulez Wisdom

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."

"I'm not angry, I'm just disappointed."

"The best things in life are free."

"You can't have everything in life, but you can have what matters most."

"A woman's intuition is rarely wrong."