“Then, as his planet killed him, it occurred to Kynes that his father and all the other scientists were wrong, that the most persistent principles of the universe were accident and error.”

“Leto turned a hard stare at Kynes. And Kynes, returning the stare, found himself troubled by a fact he had observed here: This Duke was concerned more over the men than he was over the spice. He risked his own life, and that of his son to save the men. He passed off the loss of a spice crawler with a gesture. The threat to men's lives had him in a rage. A leader such as that would command fanatic loyalty. He would be difficult to defeat.Against his own will and all previous judgements, Kynes admitted to himself: I like this Duke.”

“The smoke! The golden smoke! His robe whipped upward, turning him until his face was directed downward into the abyss. With his gaze on the depths, he recognized a maelstrom of boiling rapids there, the mirror of his life-precipitous currents and plunges, all movement gathering up all substance. Leto’s words wound through his mind on a path of golden smoke: “Caution is the path to mediocrity. Gliding, passionless mediocrity is all that most people think they can achieve.” Moneo fell freely then in the ecstasy of awareness. The universe opened for him like clear glass, everything flowing in a no Time.”

“It was mostly sweet," he whispered, "and you were the sweetest of all.”

“Men, finding no answers to the sunnan [ten thousand religious questions from the Shari-ah] now apply their own reasoning. All men seek to be enlightened. Religion is but the most ancient and honorable way in which men have striven to make sense out of God’s universe. Scientists seek the lawfulness of events. It is the task of Religion to fit man into this lawfulness.”

“Most deadly errors arise from obsolete assumptions.”

“Give as few orders as possible," his father had told him once long ago. "Once you've given orders on a subject, you must always give orders on that subject.”