Every Christmas present that sits wrapped under your Christmas tree will wear out. It will break or go out of style. This fact was there, somewhere, in the back of your mind even as you bought them, but you bought them anyway. For you love the person you bought them for, you wanted to see that look of joy it brings to their face.
So also God gives to you. But greater. What He gives will never wear out, break down, or go out of style. For what He gives is His eternal and only-begotten Son, wrapped in your flesh, and placed upon the tree of the Cross. He gives His Son for you. He gives that you may have everlasting joy. He gives because He loves you. This is why the Word became flesh to dwell among you.
And that is who is given to you. The Word who is God yet was with God from all eternity. The Word through whom all things were made. The Word who is the only-begotten Son of the Father, God of God, Light of Light, very God of very God, being of one substance with His Father. The One who called all things into existence, the One who spoke to Moses from the bush that burned yet was not consumed, the One whose glory filled the tabernacle to dwell among His people, God Himself, has taken on your flesh.
Even though the Word is made flesh, even though God became Man, His Divinity is not lessened. His Divinity is not changed. His Divinity remains, pure and unchanging, but your flesh, your human nature, is exalted. Your flesh and humanity is assumed into God. God became man so that you would become like unto God-holy and righteous, without sin, without death.
And so it is that the Son given to you wrapped in your flesh is placed upon the tree of the Cross. And no tree was ever adorned more beautifully. Its ornaments were nothing less than the Blood of God, poured out as an atoning sacrifice for your sins. Its garland the Body of God, hanged in death that you may have life. Its light the incarnate Light of the world, strung up to call you and all men unto Himself, to enlighten you, to make you His own. He gives you His life, He gives you joy and peace-peace with God in heaven and peace with one another on earth.
And from the tree of the Cross the Lord Jesus places another gift for you upon the Altar. It is the Fruit of the Cross, His crucified and risen, living Body and Blood, the Fruit of the Tree of Life, wrapped in bread and wine and given to you. He fills you with His Glory. He makes your mouths and your hearts His manger. He abides in you and you in Him.
The Word became flesh to be placed under the Cross for you. You are forgiven. This is why we give. We give because He has first given to us. And just as it was a joy for Him to give all He had to us. It is a joy for us to give to one another and His church so that this message of forgiveness, life, and salvation may be proclaimed.