"How can this be?"
Mary's question was answered seven hundred years before Jesus' birth by the prophet Isaiah who said, "The people who walk in darkness will see a great light. For those who live in a land of deep darkness, a light will shine...For a child is born to us, a son is given to us." This prophecy tells of the child to be born who would have the power of God with the government of the universe on his shoulders. The gift of Christmas is the gift of God's son--a light coming into a dark world. God has the power to bring this off and He has the love to give Him to us.
Do you have a sense of no power in your life? A child is born to you. Do you feel that you have no direction in your life? A son is given to you. You may wonder with Mary how it can happen, but, if like Mary, you will simply believe and say, "be it done unto me your servant" you will experience great wonder. Waiting is usually involved. Israel had to wait 700 years. Mary had to wait 9 months. But the life and power of God did come. And on his shoulders rested and still rests the government of the cosmos. We call Him, Wonderful Counselor, Mighty God, Everlasting Father, Prince of Peace. His rule will never end--in fact it has always been! God can do it because He has always ruled as his creation needed.
Because He loves you so much, He will not force Himself into your life. But if you let Him, He will come in power and be to you a great friend-advisor, a strength, eternal life, and your peace. What a Christmas present!