Generosity of Mind

I have a friend who actively seeks out media that communicates a worldview that he does not encounter very often or necessarily share.  This is a unique and, I think, indispensable virtue for our times.  

If we were in an ethics class, what would we call this virtue? Generosity of mind, perhaps?  Self-interrogation?  Active open-mindedness?

He is a principled person, certainly, and not swayed by every argument.  Indeed, the utility of his virtue would be much diminished if he believed everything, or worse, nothing that he heard. 

This generosity of mind makes him into a person capable of expansive relationships.  This expansiveness represents a tremendous asset to our culture and helps him build a more just world.