This Sunday is unique in the Church Year in that it causes us, whose Christianity can become casual and careless, to consider again the existence and nature of the triune God, an important and salutary thing to do. Public confession of the Athanasian Creed (LSB, pp 319–20) will be helpful. The Psalm contributes with its description and celebration of God’s omnipotence and omnipresence, evident throughout his creation. The Second Reading and Gospel recall God’s gracious plan of salvation. And the Old Testament Reading, before us as our text, provides occasion to dwell upon both: the realities that God is holy and that we, lost and condemned creatures like the prophet Isaiah, are in dire need of the salvation that God alone by grace alone has accomplished and provides to us. Our recognition of our own unworthiness in light of God’s holiness and grace, having been moved to do so by this Spirit-laden Scripture reading, will enable us to echo Isaiah’s “Here I am! Send me” (Is 6:8) as God’s messengers in our day and to a very lost world.