Cf. Bernard Shaw, Back to Methuselah (1921), Pt. I : In the Beginning: I hear you say "Why?" Always "Why?" You see things; and you say "Why?" But I dream things that never were; and I say "Why not?"
Books, Brain Droppings (1997)
Variant: Some people dream of things that never were and ask, Why not? Some people have to go to work and don't have time for all that shit.
“That some have never dreamed is as improbable as that some have never laughed.”
On Dreams
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Thomas Browne 78
English polymath 1605–1682Related quotes
“To listen to some devout people, one would imagine that God never laughs”
Sri Aurobindo : The Hour of God, and Other Writings (1970); variant "To listen to some devout people, one would imagine that God never laughed; Heine was nearer the mark when he found in Him the divine Aristophanes" in Mother India (1957)
Context: To listen to some devout people, one would imagine that God never laughs; Heine was nearer the mark when he found in Him the divine Aristophanes. God's laughter is sometimes very coarse and unfit for polite ears; He is not satisfied with being Molière, He must needs also be Aristophanes and Rabelais.
1840s, Heroes and Hero-Worship (1840), The Hero as Poet
Source: Henri Cartier-Bresson: Interviews and Conversations, 1951-1998, Conversation. Interview with Byron Dobell (1957), p. 36
“If you have never had a dream, perhaps you have only dreamt to be alive.”
Examples of self-translation (c. 2004), Quotes - Zitate - Citations - Citazioni
As quoted in "The Many Faces of Gustave Moreau" by Bennett Schiff in Smithsonian magazine (August 1999) http://www.smithsonianmagazine.com/issues/1999/august/moreau.php