In the novel Reveille for a New Gospel, Henry Knudsen believes he's living his life according to Gospel principles, especially the Sermon on the Mount and parables. But he lapses. His sister's response is a reveille, a strong wake-up call, "Change your behavior or stop visiting our home." A confused Henry seeks counsel from his parish priest, who also manages programs for the homeless where he volunteers. He follows the priest's suggestions and discerns the Gospel's guidance is essential but not enough. In the spirit of a new Gospel, he must also be kind.

But even a new...