"Glory to God in the highest
and on earth peace, goodwill among men"
When men, in gladness of heart, give first place to glorifying God in the highest (and not some man-made god on earth, in the lowest), then this brings peace on earth - and both the one and the other produce goodwill among them. The Lord Jesus came on earth so that the whole earth raise up praise to God on high, and thus bring peace on earth and goodwill among men. "I am the Lord... I make peace..." (Isaiah 45: 6,7).