Though HRV may play a role in wisdom, Grossman thinks that there isn't a lot one can do to change it--it's more a matter of individual differences. But, he says, we may want to consider training people in impartial, third-person perspective taking to help them be wiser in life, whether they have high HRV or not.
I typically agree with much of what David Brooks has to say. However, I'm afraid that he was way off the mark with his article "How Covenants Make Us." Demographic diversity in the United States is a good thing. The problem has to do with the lack of integration and assimilation of demographically diverse communities.