“Art always serves beauty, and beauty is the joy of possessing form, and form is the key to organic life since no living thing can exist without it.”

Small Houses: Their Economic Design and Construction (1922)

Referencing Oscar Wilde from the preface of "The Picture of Dorian Gray"; "All art is quite useless".
1990s, Moab is My Washpot (autobiography, 1997)
Source: Moab Is My Washpot
Context: … but love, like all art, as Oscar said, it's quite useless. It is the useless things that make life worth living and that make life dangerous too: wine, love, art, beauty. Without them life is safe but not worth bothering with.

"The Vision", stanza 2; The Poetical Works of Thomas Traherne, B.D. (London: Bertram Dobell, 1903) p. 20.

Quoted in C.R. Leslie, Memoirs of the Life of John Constable, Composed Chiefly of His Letters (1843), (Phaidon, London, 1951), p. 280
Reply "to a lady who, looking at an engraving of a house, called it an ugly thing"
posthumous, undated

Light (1919), Ch. XXII - Light
Context: You can form no idea of the beauty that is possible! You cannot imagine what all the squandered treasure can provide, what can be brought on by the resurrection of misguided human intelligence, successively smothered and slain hitherto by infamous slavery, by the despicable infectious necessity of armed attack and defense, and by the privileges which debase human worth. You can have no notion what human intelligence may one day find of new adoration. The people's absolute reign will give to literature and the arts — whose harmonious shape is still but roughly sketched — a splendor boundless as the rest. National cliques cultivate narrowness and ignorance, they cause originality to waste away; and the national academies, to which a residue of superstition lends respect, are only pompous ways of upholding ruins.

कला र जीवन (Art and Life)
Art and Life

Bittersweet, Chapter 2 at p. 36

Interview, Hollywood Reporter (1949)