What is the theme in The Book of Sand

The theme of the story is that the most interesting things in life may not have an answer and could harm you because when curiosity to find the answer fills your mind and you become a different person that will become obsessed with finding that one answer until you realize that you have been going down the wrong road and in that process have harmed yourself and possibly others as well.

The theme is self-reference and attempting to abandon the terribly infinite