The Exodus always remains a continual and present reality for the people of Israel—it is always on their mind. It was and remained the big salvific event of the Old Testament, yet at the same time it points forward to what God will yet/continue to do to save His people.
This living Word breaks and crushes. It comes down as crushing judgment on those who reject the Son. But it promises to heal and restore all those who fall on the Son broken, contrite, and in faith.
The thrill of God’s grace fades and the slow march toward the cross dulls the heart. At such times, the former life beckons. Temptations to return grow strong. Which makes Lent such an important annual exercise.
In our preaching it is important to decide how to understand this. Are we going to preach the “now” or the “not yet”? As the people of Israel are living in their “now,” are they hearing the words of Isaiah as the “not yet” or, the “not yet of the not yet”?
Luther recognized that in the penitential psalms, God gives us the words to cry out to Him in our distress, lament our sins, and confess trust in the promise of His righteousness in which alone is our sure and certain hope.