What were the incidents that inspired and encouraged the boy to leave his hometown and go to an alien land in The Alchemist?

The boy,
aka Santiago, has always had a desire to travel. That is why he had become a shepherd. That job
allows him to travel around the countryside of his native Spain. However, alife is not enough to
satisfy his wanderlust and allow him to achieve his Personal Legend.

His
inspiration to leave for foreign lands first comes in the form of a...