Through incarnation, God was born into humanity.
Joseph knew that Mary was with child, and he wanted to put her away secretly. But when an angel of the Lord appeared to him in a dream, he said “do not be afraid to take Mary your wife, for that which has been begotten in her is of the Holy Spirit.” (Matt. 1:20).
The Spirit of God, who is God reaching man, had come into Mary’s womb.
The child who was born of Mary was called the Mighty God (Isa. 9:6). Because He was the very God, His name was called Emmanuel—God with us (Matt. 1:23).
Listen to more on this marvelous and mysterious birth of Christ.