"And time enough, too," said Mallow, indifferently, "for a policy outdated, dangerous, and impossible. However well your religion has succeeded in the Four Kingdoms, scarcely another world in the Periphery has accepted it." (V.13.43)
If we're picking up what Mallow's putting down, he's saying that just because something worked in the past doesn't mean it'll work in the future. What do you think?