Please read the previous part in the series: The Way of the Fathers The great fear in Dune is the stagnation of mankind. It’s not something talked about much in the first novel, though it’s only alluded to through Paul Atreides’ vision of Jihad. It’s similar to our fear of the apocalypse. The reason for this fear is the understanding that stagnation equals the death for the species. The prescient vision Paul receives provides salvation through something called
Manifest Destiny!