Most deadly errors arise from obsolete assumptions.

Police are inevitably corrupted. ... Police always observe that criminals prosper. It takes a pretty dull policeman to miss the fact that the position of authority is the most prosperous criminal position available.

Life is a mask through which the universe expresses itself.

Arrakis teaches the attitude of the knife - chopping off what's incomplete and saying: "Now it's complete because it's ended here."

You've heard of animals chewing off a leg to escape a trap? There's an animal kind of trick. A human would remain in the trap, endure the pain, feigning death that he might kill the trapper and remove a threat to his kind.

He who can destroy a thing, can control a thing.

He who controls the spice controls the universe.