At Christmas, we do not celebrate primarily that God became a human being but that God, a human Being, was born. At His birth, Jesus moved from the womb of Mary to the outside world. This made it possible for people to relate to Him in a personal way. Jesus was then able to be held, kissed, touched, seen, and heard. He was also able to be hit, hurt, rejected, and crucified. The change from being in the womb to living in the outside world is dangerous. That's why we celebrate a birth. A dangerous transition has been made without any serious problems, although the danger of living in a fallen world still remains.
By the power of the Holy Spirit, we can still relate to Jesus in a personal way. We can be like Mary, Joseph, the shepherds, the wise men, Simeon, and Anna. We can lavish our love on Jesus — person to Person. However, we can also be like Herod by rejecting Jesus and refusing to make any room for Him in our lives and hearts (see Lk 2:7). Christmas reminds us that Jesus remains available to us on a person to Person basis.
On this first day of the Christmas season, obey the first commandment of all. Love the Lord with all your heart, all your soul, all your mind, and all your strength (Lk 10:27).