What does Luke 2:13 mean?

After Jesus was born in Bethlehem (Luke 2:6–7), an angel appeared to proclaim the good news to common shepherds (Luke 2:8–12). The men were terrified before being comforted by the angel's explanation. His appearance to them, most likely, was meant to emphasize God's intent to spread to gospel to all people, and to value even the least-valued people of the world to do it (1 Corinthians 1:26–29). The message is extraordinarily important, and a fulfillment of prophecy (Isaiah 7:14; 9:6–7; Micah 5:2).

Now, the shepherds are privileged to see an enormous number of angels, all at once, praising God. The Greek root word used to describe this gathering is the same from which we derive the English word "plethora." Their song (Luke 2:14) celebrates God's glory and the peace which the Savior brings to those who believe (John 3:16–18).