“Jessica stopped beside him: ‘What delicious abandon in the sleep of a child.’He spoke mechanically: ‘If only adults could relax like that.’ ‘Yes.’‘When do we lose it?’ He murmured…‘We do indeed lose something,’ she said.”

“If we deny the need for thought, Moneo, as some do, we lose the powers of reflection; we cannot define what our senses report. If we deny the flesh, we unwheel the vehicle which bears us. But if we deny emotion, we lose all touch with our internal universe. It was emotions which I missed the most.”

“Where is Alia?' she asked.'Out doing what any good Fremen child should be doing in such times,' Paul said. 'She’s killing enemy wounded...”

“The beginning of knowledge is the discovery of something we do not understand.”

“What do such machines really do? They increase the number of things we can do without thinking. Things we do without thinking-there’s the real danger.”

“When a wise man does not understand, he says: "I do not understand." The fool and the uncultured are ashamed of their ignorance. They remain silent when a question could bring them wisdom.”

“The child who refuses to travel in the father's harness, this is the symbol of man's most unique capability. "I do not have to be what my father was. I do not have to obey my father's rules or even believe everything he believed. It is my strength as a human that I can make my own choices of what to believe and what not to believe, of what to be and what not to be.”