To our faith the fact is presented that Christ is the Shepherd, the only one who lays down His life for His sheep. No human being, no saint, no angel could accomplish the great work of redeeming fallen man, whom the devil, through the sin committed in paradise, had hurled into death; Christ alone could be this Redeemer through His death. This was this Shepherd’s proper work, which no one else can imitate, as little as any other of His works done for our salvation can be equaled. No one can therefore appropriate to himself the words which Christ here uses: “I am the good Shepherd: the good Shepherd giveth his life for the sheep.” With these words He would teach us to trust in Him, to regard the sufferings of all the saints as naught when compared with His sufferings in our behalf. Moses, the prophets and the apostles were eminent men, true and watchful shepherds and rulers among the people of God; they taught and preached aright what it behooved men to believe and to do; they also suffered much on that account, the most of them even dying the martyr’s death; yet notwithstanding all this they can in no wise be compared with Christ. He is the Only Begotten of the Father, the Lord of glory, the true and only Shepherd over all, who from the foundation of the world spake through the patriarchs and the prophets, and in the fullness of time became man, revealing His Father’s will. He indeed “laid down His life for the sheep,” for all who believe in Him, who trust in Him in life and in death, assured that in Him there is redemption from the power of the devil who held the whole human race in the bondage of sin and death. He also established an everlasting Church throughout the world, and keeps it through His Word, continually increasing her boundaries, that His name may be hallowed and worshiped and confessed. To this end He gave unto the Church His Holy Spirit, the Comforter, who protects her by power divine against the wrath, fury and murderous assaults of the devil and his servants. And though very many lose their life as martyrs of their faith and confession now, yet will they, in the great day of resurrection, be brought by Him into life eternal with all the elect, where there is inexpressible joy and happiness unalloyed; and this to the utter confusion and everlasting shame of His enemies and theirs. (Luther’s House Postil, Second Sunday after Easter, Volume 2, p. 526-527)

These are most precious words, by which Christ invests the disciples with the office of preaching, making arrangements for the application of the glorious results of His sufferings and resurrection. For if this great occurrence had not been preached in its various bearings, if it had remained a mere historical event, it would have been of no avail for us. This we learn from the condition of the Papists. They are acquainted with the event and its record as well as we, but they do not preach it as Christ directs; hence their mere historical knowledge of it benefits them no more than if it were the story of Dietrich of Bern, which one hears and learns; they have simply the recollection of the occurrence. It is therefore absolutely necessary to make a proper use of the narrative of Christ’s sufferings and resurrection. How to do this we learn from the words of the Lord Himself when He says: “As my Father hath sent me, even so send I you.” And how the Father sent Christ was described long ago by the prophet Isaiah in the 61. chapter, where it reads: “The Spirit of the Lord God is upon me; because the Lord has anointed me to preach good tidings unto the meek; He hath sent me to bind up the brokenhearted, to proclaim liberty to the captives, and the opening of the prison to them that are bound; to proclaim the acceptable year of the Lord.” With such instructions Christ was sent, and now declares that in no other way will He send His disciples. He entrusts to them the office of preaching, that it may remain in force even to the end of time, and He orders them to preach just as He preached while in the flesh. This command then, and this mission to preach, has reference only to the doctrine to be taught; the disciples are instructed to preach no other doctrine than that which Christ Himself proclaimed.  (Luther’s House Postil, First Sunday after Easter John 20:19-31, Volume 2, p. 515)