The lyrics were taken from Isaiah 9:6. A messianic prophesy written 700 years before Christ's birth.
“The government will be upon on His shoulders” affirms His lordship uber alles. This is a prophesy of the Millennium. It speaks of and anticipates the time when Christ will reign over a literal, earthly, geopolitical kingdom that encompasses all the kingdoms and governments of the world.
The Millennium s a post rapture earth where the enemies of Christ have been damned to hell for eternity and Jesus The Prince Of Peace sits on the throne of the world in Jerusalem as the Wonderful, Counselor adjudicating righteousness and peace to the great pleasure of the inhabitants of the earth.