The Christmas message itself is that God chooses common people to do the most uncommon things. No matter how common you are, and no matter how simple you are, God has a plan and ability to come into our world and do something unusual.
Tessa was convinced that it was a lie, and also that everything she had done in her life, telling herself that it was for the best, had been no more than blind selfishness, generating confusion and mess all around. But who could bear to know which stars were already dead, she thought, blinking up at the night sky; could anybody stand to know they all were?