Reading books it's a good habit, BUT be careful what you read because what you read is changing your mind.
In my case, I only read non-fictional books and tehnical books ( IT, biology, medicine, healthcare ...).
I still remember the question I asked when I was little: Why should I learn to read?
I don't mind having my mind changed. Why should I? It's a good thing, I see each book as an add-on on what I already have there as core values and principles. Thank you for the comment.
You should worry when you read a book that brings the wrong ideas. Otherwise no problem.
Hmm...for me this are the best ones. Training for myself to be able to choose between ideas and to make sure I have others perspective also. Staying in a box and accepting around just what I see as good idea now is not helping me grow. But I see your point.