The Question and Answer section for The Alchemist (Coelho) is a great resource to ask questions, find answers, and discuss the novel.
Santiago dreams that he is in a field of sheep when a child approaches him. The child plays with the sheep and Santiago asks him to stop. The child keeps playing with the sheep. Finally the child takes Santiago by the hands and transports him to...
Is this the example of personification you are referring to?
"The lake was silent for some time. Finally, it said, “I weep for Narcissus.”
The horseman, who ends up being the Alchemist, points Santiago in the South direction to find him. It is significant because Santiago does not trust his senses when he first sees the horseman.