CHALLENGE: "Have you seen The Preacher?"
RESPONSE: "I have seen a sandworm."
CHALLENGE: "What about that sandworm?"
RESPONSE: "It gives us the air we breathe."
CHALLENGE: "Then why do we destroy its land?"
RESPONSE: "Because Shai-Hulud [sandworm deified] orders it."

-Riddles of Arrakis by Harq al-Ada