It is right and proper that whenever a Christian witnesses a baptism, he remember the promises Christ gave to him at his own baptism. We remember that it was at that time that the Gospel which had been preached to us in Word was delivered to us personally, applied in the water traced in a cross on our foreheads in the name of our Triune God. It was at that time, when the pastor spoke on Christ's behalf that we (yes, us indeed!) were recipients of Jesus' promises, we were united with Him in His baptism, that we were likewise united with Him in His death, and so too, united with Him in His resurrection to new life!
"Do you not know that all of us who have been baptized into Christ Jesus were baptized into his death? We were buried therefore with him by baptism into death, in order that, just as Christ was raised from the dead by the glory of the Father, we too might walk in newness of life. For if we have been united with him in a death like his, we shall certainly be united with him in a resurrection like his. We know that our old self was crucified with him in order that the body of sin might be brought to nothing, so that we would no longer be enslaved to sin. For one who has died has been set free from sin. Now if we have died with Christ, we believe that we will also live with him." Romans 6:3-8
The beauty of the Gospel being applied to us in baptism is that when we sin, when we fall or are faint of faith, we don't despair of our salvation. We cling to Christ's promises that He gave at our baptism. When the devil attacks, we are able to tell him to go hell, that he has no right to molest or accuse us, because we are baptized, sealed by the Holy Spirit! We are Christ's and Satan has no longer any power over us. And we are more than sure we are Christ's, because He claimed us individually.
What does Baptism give or profit?--Answer: It works forgiveness of sins, delivers from death and the devil, and gives eternal salvation to all who believe this, as the words and promises of God declare.
Which are such words and promises of God? Answer: Christ, our Lord, says in the last chapter of Mark: He that believeth and is baptized shall be saved; but he that believeth not shall be damned. (Luther's Small Catechism, IV, 2)
The other wonderful beauty which I expect on Lucie's baptism is that it's the first Sunday of Advent. During Advent, we speak of John the Baptist preparing the way for the coming of the Lord by doing his work of baptizing people for repentance. Christ's baptism, which we receive, is greater than John's baptism, but it's an interesting connection that Lucie's baptism, in Advent, will prepare her and giver her confidence for the coming of the Lord. Lovely.
On Jordan's bank the Baptist's cry
Announces that the Lord is nigh;
Awake and hearken, for he brings
Glad tidings of the King of kings!
May you have a blessed Advent, and may you be prepared for the coming of the Lord: the coming in His birth at Christmas, our remembrance of His coming into Jerusalem to finish the work which He set out from before time to accomplish, and our hopeful gaze toward the skies as we eagerly anticipate his glorious and imminent return.