The shepherds bore witness to what they had experienced. Imagine it is the evening of the day the Shepherds came to visit. Mary lays her head on the pillow, but she can't sleep. Return to verse 10. This is a summary of what the message of the gospel is all about.
Some news is news worthy, but is bad news.
Other news is positive, but not all that exciting or newsworthy. This is good news of great joy. He is laying on the couch on Sunday afternoon watching football. He has a beer on one side and some cold pizza on the other. Let's talk about believers for bit.