As Christ is one, so the Christian mission is one. That one mission can be and should be advanced in diverse ways. Legitimate diversity, however, should not be confused with existing divisions between Christians that obscure the one Christ and hinder the one mission. There is a necessary connection between the visible unity of Christians and the mission of the one Christ. We together pray for the fulfillment of the prayer of Our Lord: “May they all be one; as you, Father, are in me, and I in you, so also may they be in us, that the world may believe that you sent me.” (John 17) We together, Evangelicals and Catholics, confess our sins against the unity that Christ intends for all his disciples.