The Sanctus that we pray at each and every Mass is the prayer of the angels, a prayer that we join with in profound adoration of Almighty God. Of this great prayer, the Benedictine Abbot Prosper Guerrenger writes,
"In the Old Testament even, this Angelic Cry was already made known: the Prophet Isaias heard it; in the New Testament, John, the Beloved Disciple, names it in his Apocalypse. So then, God is indeed Holy, He delights in revealing this to us. But, to Holiness is added yet more still: Sanctus Dominus Deus Sabaoth, Holy is the Lord, the God of Armies; this is like saying: Deus Sanctus et fortis, God, the Holy and the Strong. So here we have Two Things in God, Sanctity and Strength. This expression Deus Sabaoth or Deus exercituum, the God of Armies, is used, because nothing gives such an idea of Strength, as an army surmounting all obstacles, laughing at difficulties, and over-riding all that comes in its way: thus is the Strength of God vividly expressed. So then, God is Holy and Strong.
The Glory of the New Born Christ