Angels are sinless but do not know everything, when a third of the angels fell, hell was their eternal destination without any chance of reprieve. But they did not know what would go down at Calvary, they thought they were victorious as the Son of God bowed His head and gave up His Spirit.

Angels witnessed all the power that was displayed at creation but they never will know what it is like to experience the grace and mercy that was extended to mankind at the cross, to claim the precious gift of sins forgiven, we have the privilege of calling Him  ABBA FATHER.