“Growth is limited by that necessity which is present in the least amount.”

“Growth is limited by the necessity which is present in the least amount. And naturally, the least favorable condition controls the growth rate”

“The limit of the law is the limit of enforcement—the real limit of organized society.”

“What has mood to do with it? You fight when the necessity arises—no matter the mood! Mood's a thing for cattle or making love or playing the baliset. It's not for fighting.”

“In all of my universe I have seen no law of nature, unchanging and inexorable. This universe presents only changing relationships which are somtimes seen as laws by short-lived awareness. These fleshy sensoria which we call self are ephemera withering in the blaze of infinity, fleetingly aware of temporary conditions which confine our activities and change as our activities change. If you must label the absolute, use its proper name: Temporary.”

“Sometimes I wonder about Piter," the Baron said. "I cause pain out of necessity, but he...I swear he takes a positive delight in it."-Baron Vladimir”

“Many have marked the speed with which Muad'Dib learned the necessities of Arrakis. The Bene Gesserit, of course, know the basis of this speed. For the others, we can say that Muad'Dib learned rapidly because his first training was in how to learn. And the first lesson of all was the basic trust that he could learn. It is shocking to find how many people do not believe they can learn, and how many more believe learning to be difficult. Muad'Dib knew that every experience carries its lesson.”