"Human Unity Real and Imagined." First Things (October 2012): 47-52. Also published as "L'Église entre l'humanité réelle et l'humanité rêvée" (text in English), chap. 9 in The Global Quest for "Tranquillitas Ordinis": "Pacem in Terris", Fifty Years Later, ed. Mary Ann Glendon, Russell Hittinger, and Marcelo Sánchez Sorondo (Vatican City: Pontifical Academy of Social Sciences, 2013), 109-18.

Online:
First Things
Pontifical Academy of Social Sciences [pdf]