Rest in the mystery of Christ's dual nature that you might have the constant consolation of truth rather than the doubt of crafty reasoning...

Since in the Holy Scriptures Christ is called a mystery upon which all heretics dash their heads, we admonish all Christians not to arrogantly indulge their reason in crafty investigations about such mysteries.  With the beloved apostles, they should simply believe.  They should close the eyes of their reason and bring their understanding into captivity to the obedience of Christ, and rejoice without ceasing in the fact that our flesh and blood is placed so high at the right hand of God's majesty and almighty power.  In this way we will certainly find constant consolation in every difficulty and remain well guarded against deadly error.
~BOC, FSD, VIII, 96

Christ, in both natures, is with us in all our troubles...

When such majesty is denied to Christ according to His humanity, we regard it as a deadly error.  For by this the very great consolation mentioned above is taken from Christians, which they have in the promise about the presence and dwelling with them of their Head, King, and High Priest.  He has promised them that not only His mere divinity would be with them (which to us poor sinners is like a consuming fire on dry stubble).  But Christ promised that He—He, the man who has spoken with them, who has experienced all tribulations in His received human nature, and who can therefore have sympathy with us, as with men and His brethren—He will be with us in all our troubles also according to the nature by which He is our brother and we are flesh of His flesh.
~BOC, FSD, VIII, 87

The assurance and confirmation found in the Lord's Supper...

The divine and the human nature have this personal union with each other in the person of Christ and have the communion resulting from it (in deed and truth).  For this reason, there is attributed to Christ (according to the flesh) what His flesh, according to its nature and essence, cannot be by itself.  Apart from this union, His flesh cannot have these attributes:  His flesh is a truly live-giving food and His blood a truly life-giving drink.  The two hundred Fathers of the Council of Ephesus have testified that Christ's flesh is a life-giving flesh.  Therefore, this man only, and no man besides, either in heaven or on earth, can say with truth, "Where two or three are gathered in My name, there am I among them" (Matthew 18:20).  Also, "And behold, I am with you always, to the end of the age" (Matthew 28:20).

We do not understand these testimonies to mean that only Christ's divinity is present with us in the Christian Church and Congregation, and that such presence does not apply to Christ according to His humanity in no way whatever.  For in that way Peter, Paul, and all the saints in heaven—since divinity, which is everywhere present, dwells in them—would also be with us on earth.  However, the Holy Scriptures say this only about Christ, and no other man.  We hold that by these words the majesty of the man Christ is declared.  Christ as receive this majesty, according to His humanity, at the right hand of God's majesty and power.  So also, according to His receive human nature and with the same, He can be, and also is, present where He wants to be.  He is present especially in His Church and congregation on earth as Mediator, Head, King, and High Priest.  This presence is not a part, or only one half of Him.  Christ's entire person is present, to which both natures along, the divine and the human—not only according to His divinity, but also according to, and with, His received human nature.  He is our Brother, and we are flesh of His flesh and bone of His bone.  He has instituted His Holy Supper for the certain assurance and confirmation of this, so that He will be with us, and dwell, work, and be effective in us also according to that nature from which He has flesh and blood.
~BOC, FSD, VIII, 76-79

Christ fulfills His office in, according do, with, and through both natures...

In fulfilling Christ's office, the person does not act and work in, with, through, or according to only one nature.  It works in, according to, with, and through both natures.  As the Council of Chalcedon expresses it, one nature works in communion with the other what is a property of each.  Therefore, Christ is our Mediator, Redeemer, King, High Priest, Head, Shepherd, and so on, not according to one nature only (whether it be the divine or the human), but according to both natures.
~BOC, FSD, VIII, 46-47

Christ as our sole Mediator, Atoning Sacrifice, High Priest, and Intercessor...

Our churches teach that the history of saints may be set before us so that we may follow the example for their faith and good words, according to our calling.  For example, the emperor may follow the example of David in making war to drive away the Turk from his country.  For both are kings.  But the Scriptures do not teach that we are to call on the saints to to ask the saints for help.  Scripture sets before us the one Christ as the Mediator, Atoning Sacrifice, High Priest, and Intercessor.  He is to be prayed to. He has promised that He will hear our prayer.  This is the worship that He approves above all other worship, that He be called upon in all afflictions.  "If anyone does sin, we have an advocate with the Father" (I John 2:1).
~BOC, AC, XXI, 1-4

The dual nature of Christ is such a grand, intimate, indescribable communion that the angels are astonished by and delighted in it...

The human nature, after the resurrection from the dead, is exalted above all creatures in heaven and on earth.  This is nothing other than that He entirely laid aside the form of a servant.  He did not lay aside His human nature, but retains it to eternity.  He has the full possession and use of the divine majesty according to His received human nature.  However, He had His majesty immediately at His conception, even in His mother's womb.  As the apostle testified, He laid it aside.  As Dr. Luther explains, He kept it concealed in the state of His humiliation and did not always use it, but only when He wanted to use it.

Now He has ascended to heaven, not merely as any other saint, but as the apostle testifies, above all heavens.  He also truly fills all things, being present everywhere, not only as God, but also as man.  He rules from sea to sea and to the ends of the earth, as the prophets predict and the apostles testify.  He did this everywhere with them and confirmed their word with signs.  This did not happen in an earthly way. As Dr. Luther explains, this happened according to the way things are done at God's right hand.  "God's right hand" is no set place in heaven, as the Sacramentarians assert without any ground in the Holy Scriptures.  It is nothing other than God's almighty power, which fills heaven and earth  Christ is installed according to His humanity (in deed and truth), without confusing or equalizing the two natures in their essence and essential properties.  By this communicated divine power, according to the words of His testament, He can be and is truly present with His body and blood in the Holy Supper.  He has pointed this out for us by His Word.  This is possible for no other man, because no man is united with the divine nature the way Jesus, the Son of Mary, is.  No man is installed in such divine almighty majesty and power through and in the personal union of the two natures in Christ.  For in Him the divine and the human nature are personally united with each other.  So in Christ "the whole fullness of deity dwells bodily" (Colossians 2:9).  In this personal union the two natures have such a grand, intimate, indescribable communion that even the angels are astonished by it.  As St. Peter testifies, they have their delight and joy in looking into it.
~BOC, FSD, VIII, 26-30

To Christ everything is possible and everything is known...

We believe, teach, and confess that the Son of Man really is exalted.  He is (in deed and truth) exalted according to His human nature to the right hand of God's almighty majesty and power.  For He was received into God when He was conceived of the Holy Spirit in His mother's womb, and His human nature was personally united with the Son of the Highest.

Christ always had this majesty according to the personal union.  Yet He abstained from using it in the state of His humiliation, and because of this He truly increased in all wisdom and favor with God and man.  Therefore, He did not always use the majesty, but only when it pleased Him.  Then, after His resurrection, He entirely laid aside the form of a servant, but not the human nature, and was established in the full use, manifestation, and declaration of the divine majesty.  In this way He entered into His glory.  So now not just as God, but also as man He knows all things and can do all things.  He is present with all creatures, and has under His feet and in His hands everything that is in heaven and on earth and under the earth, as He Himself testifies, in Matthew 28:18, "All authority in heaven and on earth has been given to Me."  And St. Paul says in Ephesians 4:10, "He ... ascended far above all the heavens, that He might fill all things." Because He is present, He can exercise His power everywhere.  To Him everything is possible and everything is known.
~BOC, FSD, VIII, 15-16