A global citizen. A commitment to sharing the peace of Jesus. A witness to the difference that Jesus makes. The story David Shenk either begins in Shirati Village in Tanganyika, East Africa, or we might decide it begins among the orchards of Lancaster County, Pa., where farmers with their horses line up a mile for water as they rearrange their loads for their trek home on market day. In either reading, this is a story of mission--a...