"Winter is an inimical world; its punishment for doing things wrong is sure and prompt: death from cold or death from hunger. No margin, no reprieve. A man can trust his luck, but a society can’t; and cultural change, like random mutation, may make things chancier. So they have gone very slowly. At any one point in their history a hasty observer would say that all technological progress and diffusion had ceased. Yet it never has. Compare the torrent and the glacier. Both get where they are going."
— The Left Hand of Darkness