On account of this personal union and communion of the natures, Mary, the most blessed Virgin, did not bear a mere man. But, as the angel testifies, she bore a man who is truly the Son of the most high God [Luke 1:35]. He showed His divine majesty even in His mother's womb, because He was born of a virgin, without violating her virginity. Therefore, she is truly the mother of God and yet has remained a virgin. He did all His miracles by the power of this personal union. He showed His divine majesty, according to His pleasure, when and as He willed.
He did this not just after His resurrection and ascension, but also in His state of humiliation. For example:
(a) At the wedding at Cana of Galilee [John 2:1-11]
(b) When He was twelve years old, among the learned [Luke 2:42-50]
(c) In the garden, when with a word He cast His enemies to the ground [John 18:6]
(d) In death, when He died not simply as any other man, but in and with His death conquered sin, death, devil, hell, and eternal damnation [Colossians 2:13-15]
The human nature alone would not have been able to do these miracles if it had not been personally united and had communion with the divine nature. (paragraphs 24-25)
Condensed from CONCORDIA: THE LUTHERAN CONFESSIONS, copyright 2005,2006 by Concordia Publishing House. Used by permission. All rights reserved. To purchase a copy of CONCORDIA, call 800-325-3040.