“It is of the essence of imaginative culture that is transcends the limits both of the naturally possible and of the morally acceptable.”
"Quotes", Anatomy of Criticism: Four Essays (1957), Anagogic Phase: Symbol as Monad
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Northrop Frye 137
Canadian literary critic and literary theorist 1912–1991Related quotes

“These limits are further beliefs to be transcended. In the network's mind there are no limits.”
The Human Biocomputer (1974) <!-- London: Abacus -->
Context: In the province of the mind, what one believes to be true is true or becomes true, within certain limits to be found experientially and experimentally. These limits are further beliefs to be transcended. In the mind, there are no limits... In the province of connected minds, what the network believes to be true, either is true or becomes true within certain limits to be found experientially and experimentally. These limits are further beliefs to be transcended. In the network's mind there are no limits.

"Doll Factory, Gun Factory" (1973), essay reprinted in The Maker of Dune : Insights of a Master of Science Fiction (1987), edited by Tim O'Reilly
General sources
“Imagine no limitations; decide what's right and desirable before you decide
what's possible.”

13 August 1793, Presenting his education plan to the National Convention
Misc Quotes
Man's Rise to Civilization (1968)
Context: At various stages of evolution, the Indian cultures were presented with only a limited number of possibilities. The members of certain kinds of societies—the small band, the large band, the tribe, the chiefdom, the state, and variations of these—tended to make characteristic choices concerning religion, law, government, and art... Such choices were not... consciously made... For a particular society, they either worked or they did not work.<!-- p. 212