The letter isn't by the author of the book. It's an "open letter" that was originally published in a newspaper being used as an example by the author of the book. This is what I have now:
Ted Lyddon Hatten, “An Open Letter to an Arsonist.” Reprinted in Becoming Jesus Prayer: Transforming Your Life Through the Lord’s Prayer, Gregory Palmer, Cindy McCalmont, & Brian Milford (Cleveland: The Pilgrim Press, 2005), 77-78.
Hatten, Ted Lyddon. “An Open Letter to an Arsonist.” Reprinted in Becoming Jesus Prayer: Transforming Your Life Through the Lord’s Prayer. By Gregory Palmer, Cindy McCalmont, and Brian Milford, 75-78. Cleveland: The Pilgrim Press, 2005.