Quote of Jasper Johns, as cited in Trend to the Anti-Art: Targets and Flags, Newsweek 51 no. 13, March 1958, p. 96
1950s
“I was thinking about Casagemas's death that started me painting in blue.”
Quoted in Pierre Daix, La Vie de Peintre de Pablo Picasso, Paris: Editions du Seuil, 1977.
Picasso explained his friend Pierre Daix (around 1965), why he started painting in blue early around 1905. Picasso had made a portrait of Carles Casagemas in 1899.
1970s
Original: C’est en passant que Casagemas était mort que je me suis mis à piendre en bleu
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Pablo Picasso 128
Spanish painter, sculptor, printmaker, ceramicist, and stag… 1881–1973Related quotes

version in original Dutch: Begin maar, je palet helpt je wel voort. (als je tobde over een schilderij of ertegenop zag om te beginnen)
Quoted by Maria Bilders-van Bosse, in her letter to A.C. Loffelt, 23 June 1895; from an excerpt of this letter https://rkd.nl/nl/explore/excerpts/763 in RKD-Archive, The Hague
his usual reaction if you worried about a painting or dread to start painting
posthumous quotes
"‘6 bold statements of Nikita Gokhale’" http://timesofindia.indiatimes.com/entertainment/marathi/movies/6-bold-statements-of-Nikita-Gokhale/6-bold-statements-of-Nikita-Gokhale/photostory/45617534.cms.TimesOfIndia.com. December 23, 2014.
"Portrait of the Artist as a Naughty Boy," interview with John Mortimer, In Character (1983) p. 97
1980s

About her intent to practice Hinduism.
Q&A with Wendy Doniger, the Mircea Eliade Distinguished Service Professor and author of The Hindus

“Whenever I feel blue, I start breathing again.”

interview conducted by David Sylvester for the BBC, 1962; as quoted in Abstract Expressionism: Creators and Critics, edited by Clifford Ross, Abrahams Publishers, New York 1990, p. 45.
1960's