It was for a gift
Can you imagine what would happen if we started mixing doctoring and church planting together? In the Gospel of Luke, Jesus sent His disciples to preach the kingdom of God and heal the sick. And Jesus practiced both. Preach and Heal, by Dr. Charles Fielding, explores the ideology and practical ways for balanced ministry so that you can effectively reach the lost.
Also available on Kindle.
Having worked among unreached people groups for many years, and having read almost every book on the subject of reaching the unreached...I can say that this is one of the best on that topic. It's not only pertinent to medical missions but also to anyone working among unreached people groups.