A Holy God whose passion it is to have a holy people stand in His presence for all eternity sent His Son into this world to take on all of our sin, all that makes us unholy, all that alienates us from His holy presence, to take all of that on Himself. As the sacrifices were consumed by fire in the Old Testament Temple, so the Lord Jesus Christ offers Himself in our place. He is the Lamb of God basted with the juices of our sin and roasted over the flames of God's wrath in our stead. He becomes the holocaust - the whole burnt offering that takes away our sin. In His flesh, Jesus is the very Temple of God and those who are joined to Him in Holy Baptism are made members of His royal priesthood, sanctified by His blood to offer spiritual sacrifices.
Holy people live holy lives.
Luther's doctrine of vocation begs to be rediscovered in our church. That doctrine is the setting and the context for both the doctrine of the royal priesthood and the doctrine of sanctification. This can be seen from Luther's treatise of 1520, On the Freedom of the Christian. Faith lives in the freedom of Christ Jesus. Love lives a life of service to the neighbor.