Martin Luther emphasized service to God in one's calling in life, not artificial forms of piety. He called this the doctrine of Vocation. Government, instituted by God in the Fourth Commandment, Honor your father and mother...,was good but there are limits to governmental and temporal authoritys power. Dr. Mackenzie explains Luther's Two-Kingdoms doctrine, spiritual (Church) and temporal (State). Mixing the Church's Gospel into the State as well as mixing the State's law into the Church creates problems. The Church, not State, is to combat false religion using God's Word. A Christian lives not in himself, but in Christ and in his neighbor. A Christian lives in Christ through faith, in his neighbor through love, doing works directed toward the benefit, honor and salvation of others. Today we live in these "two kingdoms" and have responsibilities toward others in both.