"These two details--the necessity of a manger and the lack of room with normal society-- are both significant and unexpected. Why would God's own Son, the expected Davidic Messiah, be born in such a way? This scandalous set of circumstances points forward to Jesus's future rejection by his own people and the shame and embarrassment of death on a cross. The unexpected setting of Jesus's birth also anticipates the unexpected way in which Jesus would go about putting things right in God's creation. His life and death did not match people's expectations. He wasn't born like a king; he didn't live like a king; and he certainly didn't die like a king. He was nonetheless God's promised and long-awaited King."
--From The First Days of Jesus, by Andreas Kostenberger and Alexander Stewart (Crossway, 2015).