“We do not ask for what useful purpose the birds do sing, for song is their pleasure since they were created for singing. Similarly, we ought not to ask why the human mind troubles to fathom the secrets of the heavens. The diversity of the phenomena of nature is so great and the treasures hidden in the heavens so rich precisely in order that the human mind shall never be lacking in fresh nourishment.”
As quoted in Cosmos (1980) by Carl Sagan.
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Johannes Kepler 51
German mathematician, astronomer and astrologer 1571–1630Related quotes

Autobiography (1873)
Context: I had obtained some distinction, and felt myself of some importance, before the desire of distinction and of importance had grown into a passion: and little as it was which I had attained, yet having been attained too early, like all pleasures enjoyed too soon, it had made me blasé and indifferent to the pursuit. Thus neither selfish nor unselfish pleasures were pleasures to me. And there seemed no power in nature sufficient to begin the formation of my character anew, and create in a mind now irretrievably analytic, fresh associations of pleasure with any of the objects of human desire.

George Horne (bp. of Norwich.) (1799). Discourses on several subjects and occasions. Vol. 1,2, p. 357; As quoted in Allibone (1880)

“Why do we live? Most of us need the very thing we never ask for.”
Letter to Robert McAlmon (4 September 1943), published in The Selected Letters of William Carlos Williams (1957) edited by John C. Thirlwall, p. 217
General sources
Context: Why do we live? Most of us need the very thing we never ask for. We talk about revolution as if it was peanuts. What we need is some frank thinking and a few revolutions in our own guts; to hell with what most of the sons of bitches that I know and myself along with them if I don't take hold of myself and turn about when I need to — or go ahead further if that's the game.
“He was like a song I'd heard once in fragments but had been singing in my mind ever since.”
Source: Memoirs of a Geisha

Dubuffet once explained to Jacques Berne; as cited in 'Dubuffet, Lévi-Strauss, and the Idea of Art Brut', Kent Minturn, from RES: Anthropology and Aesthetics, No. 46, Polemical Objects (Autumn, 2004), pp. 247-258 http://www.columbia.edu/cu/arthistory/faculty/Minturn/Dubuffet-Levi-Strauss.pdf, p. 256
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