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

She's tired , he thought. We must find some way to ease her burdens .
Gurney strummed a chord.
Paul glanced at him, said: "I've . . . things that need my attention. Wait here for me."
Gurney nodded. His mind seemed far away, as though he dwelled for this moment beneath the open skies of Caladan with cloud fleece on the horizon promising rain.
Paul forced himself to turn away, let himself out through the heavy hangings over the side passage. He heard Gurney take up a tune behind him, and paused a moment outside the room to listen to the muted music.
"Orchards and vineyards,
And full-breasted houris,
And a cup overflowing before me.
Why do I babble of battles,
And mountains reduced to dust?
Why do I feel these tears?
Heavens stand open
And scatter their riches;
My hands need but gather their wealth.
Why do I think of an ambush,
And poison in molten cup?
Why do I feel my years?
Love's arms beckon
With their naked delights,
And Eden 's promise of ecstasies.
Why do I remember the scars,
Dream of old transgressions . . .
And why do I sleep with fears?"
A robed Fedaykin courier appeared from a corner of the passage ahead of Paul. The man had hood thrown back and fastenings of his stillsuit hanging loose about his neck, proof that he had come just now from the open desert.
Paul motioned for him to stop, left the hangings of the door and moved down the passage to the courier.
The man bowed, hands clasped in front of him the way he might greet a Reverend Mother or Sayyadina of the rites. He said: "Muad'Dib, leaders are beginning to arrive for the Council."
"So soon?"
"These are the ones Stilgar sent for earlier when it was thought . . ." He shrugged.
"I see." Paul glanced back toward the faint sound of the baliset, thinking of the old song that his mother favored—an odd stretching of happy tune and sad words. "Stilgar will come here soon with others. Show them where my mother waits."
"I will wait here, Muad'Dib," the courier said.
"Yes . . . yes, do that."
Paul pressed past the man toward the depths of the cavern, headed for the place that each such cavern had—a place near its water-holding basin. There would be a small shai-hulud in this place, a creature no more than nine meters long, kept stunted and trapped by surrounding water ditches. The maker, after emerging from its little maker vector, avoided water for the poison it was. And the drowning of a maker was the greatest Fremen secret because it produced the substance of their union—the Water of Life, the poison that could only be changed by a Reverend Mother.
The decision had come to Paul while he faced the tension of danger to his mother. No line of the future he had ever seen carried that moment of peril from Gurney Halleck. The future—the gray-cloud-future—with its feeling that the entire universe rolled toward a boiling nexus hung around him like a phantom world.
I must see it , he thought.
His body had slowly acquired a certain spice tolerance that made prescient visions fewer and fewer . . . dimmer and dimmer. The solution appeared obvious to him.
I will drown the maker. We will see now whether I'm the Kwisatz Haderach who can survive the test that the Reverend Mothers have survived .
And it came to pass in the third year of the Desert War that Paul-Muad'Dib lay alone in the Cave of Birds beneath the kiswa hangings of an inner cell. And he lay as one dead, caught up in the revelation of the Water of Life, his being translated beyond the boundaries of time by the poison that gives life. Thus was the prophecy made true that the Lisan al-Gaib might be both dead and alive.
—"Collected Legends of Arrakis" by the Princess Irulan
Chani came up out of the Habbanya basin in the predawn darkness, hearing the 'thopter that had brought her from the south go whir-whirring off to a hiding place in the vastness. Around her, the escort kept its distance, fanning out into the rocks of the ridge to probe for dangers—and giving the mate of Muad'Dib, the mother of his firstborn, the thing she had requested: a moment to walk alone.