“One mind can think only of its own questions; it rarely surprises itself.”
Source: Ender's Shadow
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Orson Scott Card 586
American science fiction novelist 1951Related quotes
“Imagination… its limits are only those of the mind itself.”

i.254-255
Paradise Lost (1667)
Variant: The mind is its own place, and in itself
Can make a heav'n of hell, a hell of heav'n.
Source: Paradise Lost: Books 1-2
Source: Social Amnesia: A Critique of Conformist Psychology from Adler to Laing (1975), p. 1

“It's a damn poor mind that can only think of one way to spell a word.”
More commonly misattributed to Andrew Jackson, the originator of this line is actually unknown.
Misattributed

“Evil does not question itself. Only Hope questions itself.”
Between the Bridge and the River (2006)