I had taken the day off from my job as supervising chaplain at Trenton's New Jersey State Prison (NJSP), when my wife called and told me the news. It was September 11, 2001. Like most Americans, I spent much of the remainder of the day in front of the television, transfixed by the images flashing in front of me on the screen.

When I conferred with my Muslim and Roman Catholic colleagues at the prison the next morning, it became clear that the Chaplaincy Department needed to develop a coordinated response to the issues the attack raised among the inmate population. This was confirmed a day or two later when the Commissioner of the Department of Corrections issued orders to prison administrators statewide to report on measures being taken to keep the peace within each institution.

At issue was the fear that the 9/11 attacks would incite extremist fervor among the Muslim inmates, leading to violence within the prisons. Such concerns, understandable though they were in the already-tense atmosphere that pervades most prisons, were overblown. For example, at NJSP, which houses the state's toughest inmate population, the prisoners comported themselves admirably. While there were scattered reports of irresponsible comments by a few Muslim inmates, the Muslim community as a whole—under the leadership of a strong inmate imam who was respected throughout the prison—effectively regulated itself. The prison's other religious congregations followed suit.

For our part, each chaplain's weekly congregational sermon or teaching drew from principals of peace inherent in that faith. We distributed literature on the same theme within our congregations, worked closely with congregational leaders to keep our fingers on the pulse of the situation, and maintained an ongoing dialogue with administration officials and correctional staff, who had implemented measures governing inmate movements and activities.

Thus was a potential disaster averted, both at NJSP and other facilities throughout the state. The key to this success was, in my opinion, the recognition by senior prison and corrections officials of the importance of chaplaincy staff in addressing the delicate religious issues at stake.

In prison, where convicted felons are physically (and often emotionally) ostracized from their families and society as a whole because of their crimes, the need for personal redemption takes on paramount importance. For many, religious faith and practice become the means of such redemption, as well as the source of a new self-identity. One of the many roles of a chaplain is to facilitate this self-awareness, helping the prisoner to gain a healthier perspective on himself/herself and others. To impede this process in any way risks incurring the wrath of an already volatile individual. Multiply that by the number of inmates in a given institution and you have a dangerous situation indeed.

Thus for correctional chaplains, navigating dangerous religious terrain—diplomacy at its most essential level—is their stock-in-trade.

It is against this background that I've begun reading Douglas M. Johnston's new book, Religion, Terror and Error: U.S. Foreign Policy and the Challenge of Spiritual Engagement. Although I'm still reading the book and hardly qualify as an authority on statecraft, it's clear to me that Johnston "gets it": religion plays an indispensible role in diplomacy between people groups, including United States foreign policy.