Actually both positions are implicit in the paintings, so you don't have to choose.
The Insiders, Rejection en Rediscovery of Man in the Arts of our Time, Selden Rodman, Baton Rouge, Louisiana State University Press, 1960, Chapter 6.
1960s
“[to see the painting].. as an object, as a real thing in itself. (quote on his Flag-paintings)”
Quote from: Abstract Art, Anna Moszynska, Thames and Hudson 1990, p. 200
1950s
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Jasper Johns 34
American artist 1930Related quotes

“Paint what you feel. Paint what you see. Paint what is real to you.”
Source: Henri, Robert (2007) [1923], p. 285.

Statement attributed to Rembrandt in early biographies, as quoted in The Rise of the Cult of Rembrandt: Reinventing an Old Master in Nineteenth-Century France (2003) by Alison MacQueen
One of the popular aphorisms about Rembrandt's paintings, drawn from his early biographies in early 19th century and repeatedly attributed to the artist by the French writers and artists [ https://books.google.nl/books?id=N0dVqAsR5k0C&pg=PA292&lpg=PA292&dq=The+Rise+of+the+Cult+of+Rembrandt:+Reinventing+an+Old+Master+in+Nineteenth-century+France&source=bl&ots=SgL2TN2Xct&sig=ZJuOkH35vmifBkzcu5ASLdLyhTI&hl=en&sa=X&ved=0ahUKEwjx17OkrpfVAhWKnBoKHQlxA0oQ6AEIVzAJ#v=onepage&q=The%20Rise%20of%20the%20Cult%20of%20Rembrandt%3A%20Reinventing%20an%20Old%20Master%20in%20Nineteenth-century%20France&f=false/The Rise of the Cult of Rembrandt: Reinventing an Old Master in Nineteenth-Century France, 2003,p. 287 ]
undated quotes
“Short quote of Newman about his first 'Zip' paintings, c. 1946-1948”
1940 - 1950

“I paint objects as I think them, not as I see them.”

Source: 1930s, On my Painting (1938), pp. 12-13

Quote from: 'Questions to Stella and Judd', Bruce Glaser, Art News, September 1966, p 58-59
Quotes, 1960 - 1970
Source: Art on the Edge, (1975), p. 237-9, "Reality Again: The New Photorealism"

Quote in an open letter ('Credo'), (Paris, end of December 1861), published in the 'Courier du Dimanche', (addressed to prospective students); as quoted in Letters of Gustave Courbet, transl. & ed. Petra ten-Doesschate Chu, University of Chicago Press 1992, pp. 203-204
1860s

quoted in 'Abstract Art', Anna Moszynska, Thames and Hudson 1990, p. 107
Hans Arp used some years earlier already this new term: 'concrete art' as a rejection of the term 'abstract art'
1920 – 1926