14 Your will be done as in heaven so on earth. God's divine and blessed Angels do the will of God, as David said in the Psalm, Bless the Lord, all you Angels of His, mighty in strength, that do His pleasure. So then in effect you mean this by your prayer, “as in the Angels Your will is done, so likewise be it done on earth in me, O Lord.”
Source: Catechetical Lectures (New Advent)