The basic lesson of our relativistic universe is that things change. Any power must always meet a greater power.

Time can also be a place.... Everything depends on where you are standing, on where you look or what you hear. The measure of it is found in consciousness itself.

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.

Face your fears or they will climb over your back.

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.

Caution is the path to mediocrity.

They say they seek security and quiet, the condition they call peace. Even as they speak they create the seeds of turmoil and violence.