Ferngren first describes how early Christians understood disease. He examines the relationship of early Christian medicine to the natural and supernatural modes of healing found in the Bible. Despite biblical accounts of demonic possession and miraculous healing, Ferngren argues that early Christians generally accepted naturalistic assumptions about disease and cared for the sick with medical knowledge gleaned from the Greeks and Romans.
Ferngren next explores the origins of medical philanthropy in the early Christian church. Rather than viewing illness as punishment for sins, early Christians believed that the sick deserved both medical assistance and compassion. Even as they were being persecuted, Christians cared for the sick both within and outside of their community. Their long experience in medical charity led to the creation of the first hospitals, a singular Christian contribution to health care.
