“Enemies strengthen you. Allies weaken.”

“Dangers lurk in all systems. Systems incorporate the unexamined beliefs of their creators. Adopt a system, accept its beliefs, and you help strengthen the resistance to change”

“It's easier to be terrified by an enemy you admire.”

“Questions are my enemies. For my questions explode!”

“Where is Alia?' she asked.'Out doing what any good Fremen child should be doing in such times,' Paul said. 'She’s killing enemy wounded...”

“Military foolishness is ultimately suicidal. They believe that by risking death they pay the price of any violent behavior against enemies of their own choosing. They have the invader mentality, that false sense of freedom from responsibility for your own actions.”

“We’ve lost something vital, I tell you. When we lost it, we lost the ability to make good decisions. We fall upon decisions these days the way we fall upon an enemy—or wait and wait, which is a form of giving up, and we allow the decisions of others to move us. Have we forgotten that we were the ones who set this current flowing?”