What I can say is that he has written an amazing blog under the above title, which I came across via a tweet (and I can't find who by now: sorry) yesterday. I strongly recommend reading it as a whole.
It is also full of some really good one liners, such as:
The ideal of citizenship lies submerged in our basic obligation to take care of the stranger even when they do not seem a citizen
A community that defines itself by its existing members and which jealously guards its boundaries will become sterile and incapable of valuing even its own members
Imagine a person free of all duties and you imagine someone who is utterly disconnected. The structure of our duties describes the framework within which the good life is lived.