From "Manual of Muad'Dib" by the Princess Irulan

I'm the well-trained fruit tree , he thought. Full of well-trained feelings and abilities and all of them grafted onto me—all bearing for someone else to pick .
For some reason, he recalled his younger sister, her elfin face so clear in his mind. But she was dead now—in a pleasure house for Harkonnen troops. She had loved pansies . . . or was it daisies? He couldn't remember. It bothered him that he couldn't remember.
Paul countered a slow swing of the dummy, brought up his left hand entretisser .
That clever little devil! Halleck thought, intent now on Paul's interweaving hand motions. He's been practicing and studying on his own. That's not Duncan 's style, and it's certainly nothing I've taught him .
This thought only added to Halleck's sadness. I'm infected by mood , he thought. And he began to wonder about Paul, if the boy ever listened fearfully to his pillow throbbing in the night.
"If wishes were fishes we'd all cast nets," he murmured.
It was his mother's expression and he always used it when he felt the blackness of tomorrow on him. Then he thought what an odd expression that was to be taking to a planet that had never known seas or fishes.
YUEH (yu'e), Wellington (weling-tun), Stdrd 10,082-10,191; medical doctor of the Suk School (grd Stdrd 10,112); md: Wanna Marcus, B.G. (Stdrd 10,092-10,186?); chiefly noted as betrayer of Duke Leto Atreides. (Cf: Bibliography, Appendix VII [Imperial Conditioning] and Betrayal, The.)
—from "Dictionary of Muad'Dib" by the Princess Irulan
Although he heard Dr. Yueh enter the training room, noting the stiff deliberation of the man's pace, Paul remained stretched out face down on the exercise table where the masseuse had left him. He felt deliciously relaxed after the workout with Gurney Halleck.
"You do look comfortable," said Yueh in his calm, high-pitched voice.
Paul raised his head, saw the man's stick figure standing several paces away, took in at a glance the wrinkled black clothing, the square block of a head with purple lips and drooping mustache, the diamond tattoo of Imperial Conditioning on his forehead, the long black hair caught in the Suk School 's silver ring at the left shoulder.
"You'll be happy to hear we haven't time for regular lessons today," Yueh said. "Your father will be along presently."
Paul sat up.
"However, I've arranged for you to have a filmbook viewer and several lessons during the crossing to Arrakis."
"Oh."
Paul began pulling on his clothes. He felt excitement that his father would be coming. They had spent so little time together since the Emperor's command to take over the fief of Arrakis.
Yueh crossed to the ell table, thinking: How the boy has filled out these past few months. Such a waste! Oh, such a sad waste . And he reminded himself: I must not falter. What I do is done to be certain my Wanna no longer can be hurt by the Harkonnen beasts .
Paul joined him at the table, buttoning his jacket. "What'll I be studying on the way across?"
"Ah-h-h-h, the terranic life forms of Arrakis. The planet seems to have opened its arms to certain terranic life forms. It's not clear how. I must seek out the planetary ecologist when we arrive—a Dr. Kynes—and offer my help in the investigation."
And Yueh thought: What am I saying? I play the hypocrite even with myself .
"Will there be something on the Fremen?" Paul asked.
"The Fremen?" Yueh drummed his fingers on the table, caught Paul staring at the nervous motion, withdrew his hand.
"Maybe you have something on the whole Arrakeen population," Paul said.
"Yes, to be sure," Yueh said. "There are two general separations of the people—Fremen, they are one group, and the others are the people of the graben, the sink, and the pan. There's some intermarriage, I'm told. The women of pan and sink villages prefer Fremen husbands; their men prefer Fremen wives. They have a saying: 'Polish comes from the cities; wisdom from the desert.' "
"Do you have pictures of them?"
"I'll see what I can get you. The most interesting feature, of course, is their eyes—totally blue, no whites in them."
"Mutation?"
"No; it's linked to saturation of the blood with melange."
"The Fremen must be brave to live at the edge of that desert."
"By all accounts," Yueh said. "They compose poems to their knives. Their women are as fierce as the men. Even Fremen children are violent and dangerous. You'll not be permitted to mingle with them, I daresay."
Paul stared at Yueh, finding in these few glimpses of the Fremen a power of words that caught his entire attention. What a people to win as allies!
"And the worms?" Paul asked.
"What?"
"I'd like to study more about the sandworms."
"Ah-h-h-h, to be sure. I've a filmbook on a small specimen, only one hundred and ten meters long and twenty-two meters in diameter. It was taken in the northern latitudes. Worms of more than four hundred meters in length have been recorded by reliable witnesses, and there's reason to believe even larger ones exist."
Paul glanced down at a conical projection chart of the northern Arrakeen latitudes spread on the table. "The desert belt and south polar regions are marked uninhabitable. Is it the worms?"
"And the storms."
"But any place can be made habitable."
"If it's economically feasible," Yueh said. "Arrakis has many costly perils." He smoothed his drooping mustache. "Your father will be here soon. Before I go, I've a gift for you, something I came across in packing." He put an object on the table between them—black, oblong, no larger than the end of Paul's thumb.
Paul looked at it. Yueh noted how the boy did not reach for it, and thought: How cautious he is .
"It's a very old Orange Catholic Bible made for space travelers. Not a filmbook, but actually printed on filament paper. It has its own magnifier and electrostatic charge system." He picked it up, demonstrated. "The book is held closed by the charge, which forces against spring-locked covers. You press the edge—thus, and the pages you've selected repel each other and the book opens."
"It's so small."
"But it has eighteen hundred pages. You press the edge—thus, and so . . . and the charge moves ahead one page at a time as you read. Never touch the actual pages with your fingers. The filament tissue is too delicate." He closed the book, handed it to Paul. "Try it."
Yueh watched Paul work the page adjustment, thought: I salve my own conscience. I give him the surcease of religion before betraying him. Thus may I say to myself that he has gone where I cannot go .
"This must've been made before filmbooks," Paul said.
"It's quite old. Let it be our secret, eh? Your parents might think it too valuable for one so young."
And Yueh thought: His mother would surely wonder at my motives .
"Well . . . " Paul closed the book, held it in his hand. "If it's so valuable . . . "
"Indulge an old man's whim," Yueh said. "It was given to me when I was very young." And he thought: I must catch his mind as well as his cupidity . "Open it to four-sixty-seven Kalima—where it says: 'From water does all life begin.' There's a slight notch on the edge of the cover to mark the place."
Paul felt the cover, detected two notches, one shallower than the other. He pressed the shallower one and the book spread open on his palm, its magnifier sliding into place.
"Read it aloud," Yueh said.
Paul wet his lips with his tongue, read: "Think you of the fact that a deaf person cannot hear. Then, what deafness may we not all possess? What senses do we lack that we cannot see and cannot hear another world all around us? What is there around us that we cannot—"
"Stop it!" Yueh barked.
Paul broke off, stared at him.
Yueh closed his eyes, fought to regain composure. What perversity caused the book to open at my Wanna's favorite passage? He opened his eyes, saw Paul staring at him.
"Is something wrong?" Paul asked.
"I'm sorry," Yueh said. "That was . . . my . . . dead wife's favorite passage. It's not the one I intended you to read. It brings up memories that are . . . painful."
"There are two notches," Paul said.