Henri Matisse Quote

Expression for me does not reside in passions glowing in a human face or manifested by violent movement. The entire arrangement of my picture is expressive; the place occupied by my figures, the empty space around them, the proportions, everything has its share. Composition is the art of arranging in a decorative manner the diverse elements at the painter's command to express his feelings. In a picture every part will be visible and will play its appointed role, whether it be principal or secondary. Everything that is not useful in the picture is, it follows, harmful. A work of art must be harmonious in its entirety: any superfluous detail would replace some other essential detail in the mind of the spectator.

Notes of a Painter (1908)