“Probable impossibilities are to be preferred to improbable possibilities.”
“Accordingly, the poet should prefer probable impossibilities to improbable possibilities.”
“With respect to the requirement of art, the probable impossible is always preferable to the improbable possible.”
“Fantasy is the impossible made probable. Science Fiction is the improbable made possible.”
“Science fiction deals with improbable possibilities, fantasy with plausible impossibilities.”
“Ordinary people believe only in the possible. Extraordinary people visualize not what is possible or probable, but rather what is impossible. And by visualizing the impossible, they begin to see it as possible”