“If you do not believe this, then attempt to confine your conscious attention to the dot at the end of this sentence without involving yourself in any other form of thinking, including thinking about the dot.”

Source: Twenty Trillion Leagues Under the Sea (2014), Chapter 24, “Dakkar” (p. 234)

Source: Echoes from the Bottomless Well (1985), p. 2

2000s, Address at Stanford University (2005)

Source: Maktub

Quote of Kandinsky, c 1903; as cited by de:Wolf-Dieter Dube, in Expressionism; Praeger Publishers, New York, 1973, p. 114
1910 - 1915

Source: Pale Blue Dot: A Vision of the Human Future in Space (1994), p. 11

I said nothing to him of our experiments. He told me that of all the impressionist painters he liked my work best; this was not the first time he had said this; to each one his own taste. He does completely accept my view that the old disorderly method of execution has become impossible.
Quote of Camille Pissarro, in a letter, Eragny, 23 January 1887, to his son Lucien; in Camille Pissarro - Letters to His Son Lucien ed. John Rewald, with assistance of Lucien Pissarro; from the unpublished French letters; transl. Lionel Abel; Pantheon Books Inc. New York, second edition, 1943, p. 97
1880's

Television interview ("On clarity and exact thinking" - available on youtube)
1960s

Source: Pale Blue Dot: A Vision of the Human Future in Space