Read: Genesis 11:1-9 Key Verse: "And the LORD came down to see the city and the tower which the sons of men had built."(Gen. 11:5)
"How can this be?"
The love of God is the motivation for Him to come to earth. The power of God is how He did it. The activity of God is the way He came--He came because of His love, power, and activity--He can do it!
Early on in the history of humanity, they did what humans are want to do: Try something great apart from God. They wanted to make a name for themselves by building a city and a tower reaching to heaven. God came down to get involved. He had a better plan. He planned on our ending up in a city and actually in heaven. It would take a long time, but it would bring Him great glory all along the way.
God is involved in our world. He came down primarily in His Son at the first Christmas. "How can this be?" It can happen because God is active in His creation. We often think of the incarnation as a warm and fuzzy event--and indeed it is. But it is also a time of judgement. John the Baptist, preparing the way for Jesus said, "the axe is already laid at the root of the trees; every tree therefore that does not bear good fruit is cut down and thrown into the fire."(Luke 3:9) John called for repentance saying that God is able to make spiritual children. Christmas is a call for faith in the One who loves us and gave Himself for us. God's judgement is designed to make us want heaven on His terms. When we say yes to Him, and allow Him to be active in our lives, we begin to discover His purpose for our lives.