Why does the alchemist choose Santiago (the boy) as his pupil over the Englishman in Paulo Coelho's The Alchemist?

In Paulo Coelho's The Alchemist, the
alchemist chooses Santiago over the Englishman to be his pupil or "disciple" because the
Englishman believes that wealth in the world is found in gold. He believes that if he
reads enough books and talks to the right people (like the alchemist), he will be
successful. The Englishman does not recognize that each person has a Personal Legend and
he cannot make himself listen to or recognize the universal
language—he does not see omens or hear nature speaking to
him.

However, Santiago (the boy) has a dream, and while he
first believes that the dream involves discovering treasure at the Pyramids, he is
willing to listen to the teachings of others, like Melchizedek (the King of Salem) and
the alchemist. Santiago is able to realize that his happiness does
not depend on material wealth. It is only because he is so open to
the universe that the universe is able to speak to him and guide him to be much more
than he had ever imagined. He is able to speak the universal language, be one with
nature and the Soul of the World, and ultimately witness that it is all a part of the
Soul of God. Santiago also realizes that love is the greatest treasure in the world. The
alchemist knows that the Englishman could never do these
things.

The Englishman could ever appreciate the natural
world or be humbled enough to believe that something as simple as nature could guide
him—and the alchemist knows this. The Englishman has tunnel vision, and without true
"vision," he will never swerve from the path he has decided to
follow, therefore, we can assume he will never be happy.