After Malachi and the return of Israel from Babylon, Heaven fell silent. There was 400 years of seeming silence for the most part. A whispered forthtelling of a birth to an aging priest and a young maiden from Nazareth, but still, silence. Then a darkness-shattering wail of a newborn's cry in Bethlehem brought the season of Heaven's seeming silence to an end. The angels that heralded the Messiah's birth made a profound statement - "Glory to God in the highest and on earth peace, and goodwill toward men." Jesus' birth was a sign of peace and goodwill toward mankind. Glad tidings of great joy for all people.
Luke 2:4-14
Isaiah 9:6
2nd Corinthians 4:8-9