The Self-Donation of God, chapter 11:
"Jesus' office as king is the root office and the basis of his work as the redeemer of creation. Through this office, he fights the Father's apocalyptic war against sin, death, the law, and the Devil. As we shall see below, he conducted this war through his offices of priest and prophet. His office as king (and his other offices) was publically validated by an external divine call. As the second Adam and true minister of the Word, Jesus counteracted the Enthusiasm of our first parents by his reliance on the sure Word of Scripture and on his own public call by the Father in the power of the Spirit. What the Augustana says regarding the office of ministry with the Church is also true of the supreme minister of the Word: “they teach that no one should publicly teach in the Church or administer the Sacraments unless he has been regularly called.” Indeed, Jesus did not receive his office (as Luther described that of the Enthusiasts) “in some corner.” Rather, beginning with the revelation of his identity to his parents, Jesus' office is validated throughout his earthly life (at his baptism, his transfiguration, etc.) by God's Word of revelation concerning him."