Judica - Linked Here - Luther's Complete Sermon for the Fifth Sunday in Lent
14. Therefore Christ proceeds farther and gives the ground and reason why it is just his Word and not the word of anyone else, that giveth life, and says it is because he was before Abraham, or in other words, because he was the one true God. For if the person who offered himself as a sacrifice for us were not God, it would not help or avail anything, even if he were born of the Virgin Mary and suffered a thousand deaths. But the fact that the Seed of Abraham, who gave himself for us, is also true God, secures blessing and victory for all sinners. Therefore Christ speaks, not of his human nature that they saw and experienced; for they could easily see he was not yet fifty years of age, and did not live before Abraham. But with that nature by which he existed long before the time of Abraham, by which he existed also before all creatures and before the whole world. Just as he was man according to his spiritual nature before Abraham, that is. in his Word and in the knowledge of faith was he in the saints; for they all knew and believed that Christ, as God and man, should suffer for us, as is written in Hebrews 13:8: “Jesus Christ is the same yesterday and today, yea and for ever;” and in the Revelation of John, 13:8: “The Lamb of God that hath been slain from the foundation of the world.” Yet now he is speaking here especially of his divine nature.
15. But here reason is terribly offended and becomes mad and furious because God should become man; this reason cannot harmonize and understand. And this is the article of faith to which the Jews still in our day can not reconcile themselves, hence they cannot cease their throwing stones and their blasphemy. But Christ also continues on the other hand to hide himself from them and to go out of their temple, so that they cannot see nor find him in the Scriptures, in which they search daily. Again, this narrative is not a little terror to all who are so foolhardy about the Scriptures and never approach them with a humble spirit. For even in our day it happens that many read and study in the Scriptures and yet they cannot find Christ, he is hid and has gone out of the temple. And how many there are who say with their mouth that God is become man, and yet they are without the Spirit in their hearts; who whenever tested, prove that they were never in real earnest. This is sufficient on this subject.
