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

He has stature , she thought. Where did he learn such inner balance?
"The law that demands our form of choosing a leader is a just law," Stilgar said. "But it does not follow that justice is always the thing a people needs. What we truly need now is time to grow and prosper, to spread our force over more land."
What is his ancestry? she wondered. Whence comes such breeding? She said: "Stilgar, I underestimated you."
"Such was my suspicion," he said.
"Each of us apparently underestimated the other," she said.
"I should like an end to this," he said. "I should like friendship with you . . . and trust. I should like that respect for each other which grows in the breast without demand for the huddlings of sex."
"I understand," she said.
"Do you trust me?"
"I hear your sincerity."
"Among us," he said, "the Sayyadina, when they are not the formal leaders, hold a special place of honor. They teach. They maintain the strength of God here." He touched his breast.
Now I must probe this Reverend Mother mystery , she thought. And she said: "You spoke of your Reverend Mother . . . and I've heard words of legend and prophecy."
"It is said that a Bene Gesserit and her offspring hold the key to our future," he said.
"Do you believe I am that one."
She watched his face, thinking; The young reed dies so easily. Beginnings are times of such great peril .
"We do not know," he said.
She nodded, thinking: He's an honorable man. He wants a sign from me, but he'll not tip fate by telling me the sign .
Jessica turned her head, stared down into the basin at the golden shadows, the purple shadows, the vibrations of dust-mote air across the lip of their cave. Her mind was filled suddenly with feline prudence. She knew the cant of the Missionaria Protectiva, knew how to adapt the techniques of legend and fear and hope to her emergency needs, but she sensed wild changes here . . . as though someone had been in among these Fremen and capitalized on the Missionaria Protectiva's imprint.
Stilgar cleared his throat.
She sensed his impatience, knew that the day moved ahead and men waited to seal off this opening. This was a time for boldness on her part, and she realized what she needed: some dar al-hikman, some school of translation that would give her . . .
"Adab," she whispered.
Her mind felt as though it had rolled over within her. She recognized the sensation with a quickening of pulse. Nothing in all the Bene Gesserit training carried such a signal of recognition. It could be only the adab, the demanding memory that comes upon you of itself. She gave herself up to it, allowing the words to flow from her.
"Ibn qirtaiba," she said, "as far as the spot where the dust ends." She stretched out an arm from her robe, seeing Stilgar's eyes go wide. She heard a rustling of many robes in the background. "I see a . . . Fremen with the book of examples," she intoned. "He reads to al-Lat, the sun whom he defied and subjugated. He reads to the Sadus of the Trial and this is what he reads;
"Mine enemies are like green blades eaten down
That did stand in the path of the tempest.
Hast thou not seen what our Lord did?
He sent the pestilence among them
That did lay schemes against us.
They are like birds scattered by the huntsman.
Their schemes are like pellets of poison
That every mouth rejects."
A trembling passed through her. She dropped her arm.
Back to her from the inner cave's shadows came a whispered response of many voices: "Their works have been overturned."
"The fire of God mount over thy heart," she said. And she thought: Now, it goes in the proper channel .
"The fire of God set alight," came the response.
She nodded. "Thine enemies shall fall," she said.
"Bi-la kaifa," they answered.
In the sudden hush, Stilgar bowed to her. "Sayyadina," he said. "If the Shai-hulud grant, then you may yet pass within to become a Reverend Mother."