Gertrud the Great (1256-1302) entered the monastery of Helfta in eastern Germany as a child oblate. At the age of twenty-five she underwent a conversion that led to a series of visionary experiences, some of which she recorded in Latin "with her own hand," in what became Book Two of The Herald of God's Loving-Kindness, the standard version of her revelations. The other four books were written down by a close confidant of the saint,...