What is the meaning behind "mysterious energy" in Paulo Coelho's book The Alchemist? I feel like he means superstition in a sense, but I'm not entirely...

In 's
, Melchizedek, the King of Salem, is speaking with the boy about how to
obtain one's Personal Legend. One's Personal Legend is fulfilling one's full potential in life.
For Santiago, he must find his treasure at the Egyptian pyramids as told to him in a dream. He
must go on a journey, though, and this journey is where he discovers more about himself than
just searching for treasure. Melchizedek explains that one's Personal Legend is different for
everyone and we all know what it is when we are children. However, the following eventually
occurs:

"But as time passes, a
mysterious force begins to convince them...