How we cite our quotes: (Chapter.Paragraph)
Quote #1
"I must not fear. Fear is the mind-killer. Fear is the little-death that brings total obliteration. I will face my fear. […]" (1.83)
One of Dune's all-time classic lines. The line shows that, in a way, fear is the main antagonist in Dune, as it's the greatest obstacle standing between Paul and his goals.
Quote #2
"There were water riots when it was learned how many people the Duke was adding to the population," [Jessica] said. "They stopped only when the people learned we were installing new windtraps and condensers to take care of the load." (8.78)
Along with the gom jabbar, this quote points toward one of the pivotal fear primers in Dune—the fear of pain and suffering. Death by dehydration wouldn't be our choice of exit strategy, so we can understand the people rioting.
Quote #3
Please permit the [conservatory] to convey a lesson we learned from the same teachers: the proximity of a desirable thing tempts one to overindulgence. On that path lies danger. (10.39)
On Arrakis, you even need to be afraid of yourself. Overindulgence in water, food, or pretty much anything can weaken you. Arrakis is a lot like Sparta in this regard. The weak? They don't do so well.