Most of my open-minded friends read a lot. Most of my non-open-minded friends don't. It makes sense that the more you read, the more likely you are to be challenged by new ideas and that your commitment to your own ideas will weaken. Reading also frees you from everyday life and shows you the variety and richness of life. 
reading makes people open-minded.
Someone who loves reading literature, especially poetry, later wrote poems himself and is now a very famous poet.