I came to learn about Catherine Hamlin, a remarkable Australian surgeon, through reading her obituary. In Ethiopia, Catherine and her husband established the world’s only hospital dedicated to curing women from the devastating physical and emotional trauma of obstetric fistulas, a common injury in the developing world that can occur during childbirth. Catherine is credited with overseeing the treatment of more than 60,000 women.

Still operating at the hospital when she was 92 years old, and still beginning each day with a cup of tea and Bible study, Hamlin told curious questioners that she was an ordinary believer in Jesus who…