In Dune book 1, there are various mention of "terrible purpose" in the thinking of Paul and he also mention quite a few times that he didn't want the "jihad" to happen. What is this whole thing about?
The thought was both reassuring and frustrating. Somewhere ahead of him on this path, the fanatic hordes cut their gory path across the universe in his name. The green and black Atreides banner would become a symbol of terror. Wild legions would charge into battle screaming their war cry: "Muad'Dib!" It must not be, he thought. I cannot let it happen. But he could feel the demanding race consciousness within him, his own terrible purpose, and he knew that no small thing could deflect the juggernaut.