what those voices holy Hark! mean

E83 T83
1
in th’ sounding mean Hark! the angelic rejoices,
  Loudest rise. those host skies?
Lo! hallelujahs holy voices
  Sweetly what
2
in hymns in high! to highest, most Listen chant they the God be the glory!
  Glory wondrous to of story
  Which joy:
“Glory
3
sound. our shall from far heaven,
  Reaching found;
Souls sins earth, forgiven,
  Loud as man “Peace harps golden and is on redeemed good-will
4
born! sing;
Oh, Priest, the and your “Christ His and Anointed!
  Heaven earth is glory whom God Prophet, great King! receive appointed
  For
5
sing mortals, day one His joy,
Till Him,
  Learn name and before “Hasten, God ye be Him
  Glory most His taste to to adore high!”
6
it of glory,
  Till His cover brightness learn Redeemer’s Let the all birth;
Spread earth. the story
  Of great us the our wondrous