Santiago's encounter with the alchemist

Santiago's encounter with the alchemist occurs on the night after he has warned the tribal chieftains of an impending attack, a vision he read from the flight of two hawks. Walking back to his tent under a full moon, the boy is thrown to the ground by a sudden, violent wind and dust storm. Before him rears an enormous white horse, and astride it sits a horseman dressed entirely in black, a falcon perched on his left shoulder, his face covered except for his eyes. The stranger draws a huge curved sword, its steel glittering in the moonlight, and demands, "Who dares to read the meaning of the flight of the hawks?" Santiago, recalling the image of Saint Santiago Matamoros on his white horse with infidels beneath its hooves, recognizes that the roles are now reversed. He answers, "It is I who dared to do so," and lowers his head to receive the blow, saying that many lives will be saved because he was able to see through to the Soul of the World. The sword does not fall; instead, the stranger lowers it slowly until its point touches the boy's forehead, drawing a droplet of blood.

The Test of Courage and the Confirmation of Destiny

The alchemist's first act is a test of courage, which he declares "the quality most essential to understanding the Language of the World." He holds the sword motionless at Santiago's forehead, and the boy feels a strange joy at the prospect of dying in pursuit of his destiny and for Fatima. The alchemist asks why the boy read the flight of the birds, and Santiago replies that he read only what the birds wanted to tell him—that an army was coming to attack the oasis. When the stranger questions who he is to change what Allah has willed, Santiago answers with the camel driver's wisdom: "Allah created the armies, and he also created the hawks. Allah taught me the language of the birds. Everything has been written by the same hand." The alchemist withdraws the sword, satisfied with the answer, and tells the boy that he must not let up even after having come so far, that he must love the desert but never trust it completely, because the desert tests all men and kills those who become distracted. The boy is struck by how the stranger's words echo those of the old king, Melchizedek.

The Invitation to the Final Journey

The alchemist reveals that he knows Santiago's purpose and that the wind told him the boy would come needing help. When Santiago protests that it is the Englishman who seeks the alchemist, the alchemist replies that the Englishman has other things to do first but is on the right track. He then echoes the old king's words: "When a person really desires something, all the universe conspires to help that person to realize his dream." Santiago understands that another person has appeared to help him toward his destiny. The alchemist tells the boy that he already knows all he needs to know and that he will only point him in the direction of his treasure. When Santiago argues that he has already found his treasure—his camel, his money from the crystal shop, fifty gold pieces, and above all Fatima—the alchemist counters that none of that is from the Pyramids, and that Fatima was not found there either. He instructs Santiago to sell his camel and buy a horse, because camels are traitorous and die suddenly while horses tire bit by bit, allowing one to know how much to ask of them.

The Demonstration of the Master Work

Before they depart, the alchemist demonstrates his power by turning lead into gold at a Coptic monastery. He places lead in an iron pan, melts it, and adds a hair-thin sliver scraped from the yellow glass egg he carries—the Philosopher's Stone. The mixture turns a reddish color, almost like blood, and when it cools, the lead has become gold. The alchemist divides the gold disk into four parts: one for the Coptic monk as payment for his generosity, one for Santiago to make up for what he gave to the general, one for himself to return to the desert, and a fourth for the boy in case he ever needs it, citing the proverb that "everything that happens once can never happen again. But everything that happens twice will surely happen a third time." Santiago has now lost his savings twice—once to the thief in Tangier and once to the general—and the alchemist, as a superstitious Arab, believes in preparing for recurrence.

The Crossing and the Final Teaching

As they cross the desert, the alchemist teaches Santiago that the only way to learn is through action, and that everything the boy needs to know he has already learned through his journey. He tells the boy that the Emerald Tablet is a direct passage to the Soul of the World, and that to understand it he must immerse himself in the desert, listening to his heart because it knows all things, having come from the Soul of the World. Santiago learns to listen to his heart, understanding its dodges and tricks, and comes to accept it as it is. The alchemist warns him that before a dream is realized, the Soul of the World tests everything learned along the way, and that most people give up at that point, "dying of thirst just when the palm trees have appeared on the horizon." He tells the boy that every search begins with beginner's luck and ends with the victor's being severely tested. When they are captured by a hostile tribe and the alchemist claims that Santiago can turn himself into the wind to save their lives, the boy is terrified, but the alchemist insists that if a person is living out his destiny, he knows everything he needs to know, and that the only thing making a dream impossible is the fear of failure.

The Transformation and the Farewell

Santiago's attempt to transform into the wind becomes a dialogue with the desert, the wind, and the sun, culminating in a silent prayer to the Hand that Wrote All. The simum blows as never before, and when it ceases, the boy is standing on the far side of the camp. The alchemist smiles, having found his perfect disciple, and the chief, understanding the glory of God, provides them with an escort. The alchemist leads Santiago to within three hours of the Pyramids, tells him the story of the Roman centurion whose words became immortal, and says, "No matter what he does, every person on earth plays a central role in the history of the world. And normally he doesn't know it." They say goodbye, and the boy rides on alone, his heart now telling him where his treasure is hidden. The encounter has transformed Santiago from a shepherd following omens into a master of the Language of the World, ready to face the final test and claim his treasure.