I think that Santiago learns a variety of lessons during his journey to find his personal legend.
One lesson that I think Santiago learns is that following your dreams is never an easy thing. It's a long and difficult process that can, and does, have setback after setback. Santiago is hit with multiple setbacks during the story, and some of them even leave him contemplating giving up completely.
In conjunction with learning that following your dreams isn't easy, Santiago learns that in order to...
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