When we focus in on the witnesses of the first Christmas, the shepherds stand out for good reason. The shepherds cared for animals who were considered with more worth than even the shepherds themselves were, and they were the ones to receive the news of Jesus.
They were the outcasts, castaways, considered lower than their own sheep... and yet the glorious news of Jesus was theirs to show us something special: God loves all. To come to the people considered the least reminds us that God has left no person out of His glorious, saving plans.
Christmas, more than anything else, means that you are loved. Christmas is the unthinkable love of God on display—that when we could offer nothing to God, He sent a Savior, born to us.
And like the shepherds, all we have to do is respond.