“Always lines, never forms. Where do they find these lines in Nature? Personally I see only forms that are lit up and forms that are not, planes that advance and planes that recede, relief and depth. My eye never sees outlines or particular features or details… …My brush should not see better than I do.”
Goya, in a recall of an overheard conversation
conversation of c. 1808, in the earliest biography of Goya: Goya, by Laurent Matheron, Schulz et Thuillié, Paris 1858; as quoted by Robert Hughes, in: Goya. Borzoi Book - Alfred Knopf, New York, 2003, p. 176
probably not accurate word for word, but according to Robert Hughes it rings true in all essentials, of the old Goya, in exile
1800s
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Francisco De Goya 40
Spanish painter and printmaker (1746–1828) 1746–1828Related quotes

But all that is not yet clear in my mind.
Quote in Mondrian's letter to artist Gorin, [who stated that the double line broke the necessary symmetry], 31 January, 1934; as quoted in Mondrian, - The Art of Destruction, Carel Blotkamp, Reaktion Books LTD. London 2001, p. 215
1930's

Source: Seth, Dreams & Projections of Consciousness, (1986), p. 103-104, quoting from Seth Session 16

2 quotes from Kandinsky's letter to Hans Arp, November 1912; in Friedel, Wassily Kandinsky, p. 489; as cited in Negative Rhythm: Intersections Between Arp, Kandinsky, Münter, and Taeuber, Bibiana K. Obler (including transl. - Yale University Press, 2014
Kandinsky was trying to explain to Arp his state of mind when he made his sketch for 'Improvisation with Horses' https://upload.wikimedia.org/wikipedia/commons/c/ce/Wassily_Kandinsky_Cossacks_or_Cosaques_1910%E2%80%931.jpg, 1911, a watercolor belonging to Arp. Kandinsky had told Arp that he could have one of his pictures included in the 'Moderne Bund' (second) exhibition in Zurich, 1912, and this was the one Arp selected
1910 - 1915

International Herald Tribune (October 7, 1977)

note from his postcard, late May 1943; as quoted in Mondrian, - The Art of Destruction, Carel Blotkamp, Reaktion Books LTD. London 2001, p. 240
1940's
On not planning her stories in advance in “In a rare interview, Elena Ferrante describes the writing process behind the Neapolitan novels” https://www.latimes.com/books/la-ca-jc-elena-ferrante-interview-20180517-htmlstory.html in Los Angeles Times (2018 May 17)