Healing is one of the most constant themes in the long and sprawling history of Christianity. Jesus himself performed many miracles of healing. In the second century, St. Ignatius was the first to describe the eucharist as the medicine of immortality. Prudentius, a 4th-century poet and Christian apologist, celebrated the healing power of St. Cyprian's tongue. Bokenham, in his 15th-century Legendary, reported the healing power of milk from St. Agatha's breasts. Zulu prophets in 19th-century Natal petitioned Jesus to cure diseases caused by restless spirits. And Mary Baker Eddy invoked the...