"The design of God, in the incarnation, was
to manifest the hidden glories of His nature, and to reconcile men to
each other and to himself. The angels therefore declare that this
incarnation shall manifest and promote the glory of God,....These things the
angels desire to look into, 1 Peter 1:12,
and they desire it because they feel they are thus interested in it.
The incarnation of Jesus Christ is an infinite and eternal benefit.
Heaven and earth both partake of the fruits of it, and through it angels
and men become one family, Ephesians 3:15." AdamClarke
and on earth
2- peace,
"Peace is here put for all good, all that good which flows to us
from the incarnation of Christ." MatthewHenry
3- good will toward men.
"See how well affected the angels are to man, and to
his welfare and happiness; how well pleased they were in the incarnation of the
Son of God, though he passed by their nature; and ought not we much more to be
affected with it?" AdamClarke
Luke 2:14