“First of all, the art of living; then as my ideal profession, poetry and philosophy, and as my real profession, plastic arts; in the last resort, for lack of income, illustrations.”

The Romance of Commerce (1918), Concerning Commerce

Ibid., p. 26.
The Gist of Art (1939)

In page=18
D.V. Gundappa,Sahitya Akademi

Starement of 3 August 1867, as quoted in An Encyclopedia of Quotations about Music (1981) by Nat Shapiro, p. 115

Source: House of Leaves

Letter Ten (26 December 1908)
Letters to a Young Poet (1934)

कला र जीवन (Art and Life)
Art and Life
Context: I think human arts depend on the imaginative truths. The straight forward illustration of practicality cannot take the form of Art, not is photography any Art in my opinion.

From a letter to H. P. Lovecraft (c. July 1933)
Letters
Context: It seems to me that many writers, by virtue of environments of culture, art and education, slip into writing because of their environments. I became a writer in spite of my environments. Understand, I am not criticizing those environments. They were good, solid and worthy. The fact that they were not inducive to literature and art is nothing in their disfavor. Never the less, it is no light thing to enter into a profession absolutely foreign and alien to the people among which one's lot is cast; a profession which seems as dim and faraway and unreal as the shores of Europe. The people among which I lived — and yet live, mainly — made their living from cotton, wheat, cattle, oil, with the usual percentage of business men and professional men. That is most certainly not in their disfavor. But the idea of a man making his living by writing seemed, in that hardy environment, so fantastic that even today I am sometimes myself assailed by a feeling of unreality. Never the less, at the age of fifteen, having never seen a writer, a poet, a publisher or a magazine editor, and having only the vaguest ideas of procedure, I began working on the profession I had chosen. I have accomplished little enough, but such as it is, it is the result of my own efforts. I had neither expert aid nor advice. I studied no courses in writing; until a year or so ago, I never read a book by anybody advising writers how to write. Ordinarily I had no access to public libraries, and when I did, it was to no such libraries as exist in the cities. Until recently — a few weeks ago in fact — I employed no agent. I have not been a success, and probably never will be. But whatever my failure, I have this thing to remember — that I was a pioneer in my profession, just as my grandfathers were in theirs, in that I was the first man in this section to earn his living as a writer.

On the Death of Mr. William Harvey; reported in Bartlett's Familiar Quotations, 10th ed. (1919).