Prophet Isaiah’s vision of the holy Temple The ancient appellation “Sanctus, Sanctus, Sanctus” is believed to have first been suggested by Pope St. Clement (A.D. 88-97) in a letter to the Corinthians, although its introduction to the Mass took place approximately two centuries later. As Christians praise the holiness of God in the Liturgy, they envision the same majestic glory Isaiah describes taking place in heaven. Hence, the sacred Sanctus (“Holy, Holy, Holy”) is the most beautiful of all liturgical acclamations. The beloved triplet prayer of praise is made visible to the world through the Liturgy of the Mass, artistic imagery, sacrament and prayer. Each form uniquely enables the faithful to contemplate the beauty of God sitting on his throne with seraphs exalting his praise from above (Isa 6:3). In his vision, the Prophet Isaiah captures the angelic sight and sounds he overheard surrounding the holy…