In this passage, Mathew starts to explain why Jesus is Truth.

…for that which is conceived in her is from the Holy Spirit. (v. 20)

Our Lord became a human by the power of the Holy Spirit. From the beginning, building the Kingdom was God’s mission not a man’s mission. But Christ was made a man. Christ refers Himself as the Son of man and also the Son of God. It is God’s will that His creatures are made into sons through the only begotten Son. God wanted one of us to pay for our sins on behalf of us. Therefore, Christ became a man.

She will bear a son, and you shall call his name Jesus, for he will save his people from their sins (Matt 1:21)

God could have made another upright man like Adam as He did in the beginning to do this task.

… I tell you that out of these stones God can raise up children for Abraham. (Matt 3:9)

But He did not because the task must be fulfilled by His Son and the woman’s Seed. In this, we can see a glimpse of God’s will in creation.

Then Matthew quotes Isaiah 7:14 where it says,

… the virgin will be with child and will give birth to a son, and will call Him Immanuel (God with us).

Christ fulfils prophecies spoken in the OT, which only God can do. As God’s Word (Truth), He has fulfilled and fulfils all prophecies.

Adam was not made to become Immanuel. It is not because Adam unexpectedly failed in the garden of Eden. God’s plan has always been in His only begotten Son and the church (bride of Christ).

Matthew, like other Apostles, emphasizes on the salvation from sins. It is not only about the past sins committed by Adam and ourselves, but Christ changes the status of His people by His death and resurrection. He bought us with a price and unite with us by the Holy Spirit. This is the will of the Triune God. Salvation is the work of the Triune God. So, we are no longer rejected and hated by God. Rather, we are now the children of God and God never stops loving us despite our weaknesses.

On that day you will ask in My name, and I am not saying to you that I will request of the Father on your behalf; for the Father Himself loves you, because you have loved Me and have believed that I came forth from the Father. (John 16:26)