(For symposium on books of the twentieth century.)
First Things 101 (2000)

First Things 84 (1998)

First Things 62 (1996)

First Things 61 (1996)

First Things 51 (1995)

First Things 46 (1994)

First Things 44 (1994)

First Things 91 (1999)

Reviews Jonathan Glover, Humanity: A Moral History of the Twentieth Century.
First Things 114 (2001)

Presented at the 9th Thomistic Institute, Jacques Maritain Center, University of Notre Dame, 2004; later included as Chapter 4 of The Line Through the Heart