The answer is: Angels

Luke 2:13-14 - It is interesting to note that the angels 'said' and did not sing as we are led to believe by many of our popular hymns.

When we think about the moment when angels proclaimed "Glory to God in the highest, and on earth peace, goodwill to men," we often imagine a celestial choir, voices rising in harmonies that light up the night sky. However, the original text from Luke tells us that they simply "said" this wonderful proclamation. It's a vivid reminder that the divine communication may have been more straightforward than overly poeticized.

This greeting also captures a significant moment in the larger narrative of peace ushered into human experience. The birth of Jesus and the angelic announcement laid the foundation for a message that transcends division and chaos—encouraging a connection with the Divine and a sense of goodwill between people. Such themes of universal peace resonate deeply with similar sentiments found throughout the ancient world, from the Zoroastrian ideals of goodness to the philosophical notions of harmony espoused by thinkers in different traditions.

Moreover, the term "goodwill" dilutes into a bond among human beings to live together peacefully. Some interpret it as a clarion call for social responsibility—an invitation to extend compassion to others, fulfilling a wholesome lifestyle reminiscent of earlier traditions like those found in the Hebrew Scriptures advocating for justice and kindness. So, this simple inspiring declaration from the angels connects beautifully with broader religious principles—merging divine glory with earthly responsibility! The echoes of this proclamation can still be inspiring today's message for humanity: reconciliation and love ought to shape our actions.