“A fairly clear line separated advertisement from art. … The first effect of the triumph of the capitalist (if we allow him to triumph) will be that that line of demarcation will entirely disappear. There will be no art that might not just as well be advertisement.”

Depero (1931) "Futurism and Adverticing Art"; Partly quoted in: Jonathon Keats, " Fortunato Depero's Italian Futurism http://www.forbes.com/forbes-life-magazine/2009/0608/art-fortunato-depero-italian-futurism.html," forbes.com, 2009/06/08
Context: The art of the future will be largely advertising.
that bold and unimpeachable lesson I have learned from museums and great works from the past—
all art for centuries past has been marked by advertising purposes: the exaltation of the warrior, the saint; documentation of deeds, ceremonies, and historical personages depicted at their victories, with their symbols, in the regalia of command and splendor—
even their highest products were simultaneously meant to glorify something: architecture, royal palaces, thrones, drapery, halberds, standards, heraldry and arms of every sort—
there is scarcely an ancient work that doesn’t have advertising motifs, a garland with a trophy, with weapons of war and victory, all stamped with seals and the original symbols of clans, all with the self-celebrating freedom of ultra-advertising

Volume II, chapter VI, section 42.
The Stones of Venice (1853)
Context: We are to remember, in the first place, that the arrangement of colours and lines is an art analogous to the composition of music, and entirely independent of the representation of facts. Good colouring does not necessarily convey the image of anything but itself. It consists of certain proportions and arrangements of rays of light, but not in likeness to anything. A few touches of certain greys and purples laid by a master's hand on white paper will be good colouring; as more touches are added beside them, we may find out that they were intended to represent a dove's neck, and we may praise, as the drawing advances, the perfect imitation of the dove's neck. But the good colouring does not consist in that imitation, but in the abstract qualities and relations of the grey and purple.

The Stories of John Cheever Knopf (1978).

Statement to S. K. Neumann, as quoted Karel Čapek: Life and Work (2002) by Ivan Klima

Source: 1960s, Counterblast (1969), p. 18

Newsweek (1973-12-24).

"William Dean Howells" (1983)
1980s, At Home (1988)

The Outsider (1956)