Maktub

"Maktub" loosely translates to
"it is written" in English.  It doesn't necessarily mean something has actually been
written down on a piece of paper or stone tablet.  It's more of a destiny thing.  The crystal
merchant introduces maktub to Santiago.

"Maktub," the merchant said, finally.

"What does that
mean?"

"You would have to have been born an Arab to
understand," he answered. "But in your language it would be something like 'It is
written."

Santiago gets into some difficult
situations throughout his journeys to find the treasure and complete his own personal legend.
 But as he gains confidence and knowledge with the Soul of the World, Santiago realizes that he
can be more assured of his success.  He can be more assured of his success, because of maktub.
 Fate has a way of falling into place for those who are following their own personal legend.
 Why? Because of maktub.  Because it is written.  Santiago's success is written; it's up to him
to accept it and step into that role.