Não. As palavras ...
"The spice must flow"
... não aparece em nenhum dos romances da série original . A expressão parece vir do filme de 1984.
LISTEN TO ME!! The spice must flow... the spice has given me accelerated evolution for four thousand years... it has enabled you to live two hundred years... the spice helps make the sapho juice, which gives the red-lipped mentats the ability to be living computers... the secret side of spice... the water of life.
Possivelmente o mais próximo que ficamos na série de livros é em Dune
“A certain amount of killing has always been an arm of business,” the Baron said, “but a line has to be drawn somewhere. Someone must be left to work the spice.”
ou
Paul turned back to look at the Emperor, said: “When they permitted you to mount your father’s throne, it was only on the assurance that you’d keep the spice flowing. You’ve failed them, Majesty. Do you know the consequences?”
...
“Stop playing the fool,” Paul barked. “The Guild is like a village beside a river. They need the water, but can only dip out what they require. They cannot dam the river and control it, because that focuses attention on what they take, it brings down eventual destruction. The spice flow, that’s their river, and I have built a dam. But my dam is such that you cannot destroy it without destroying the river.”