Psalm 46 is the scripture that Martin Luther famously set to music in the hymn, "A Mighty Fortress Is Our God." 

Sometimes this is thought of as the "Battle Hymn of the Reformation." But for Luther, this hymn was more about comfort than about triumph. Luther agonized over this question: "Where can I find a friendly God? How do I know that God isn't angry with me? How can I have peace with God?" 

For the original hearers of Psalm 46, the answer was this: "There is a river who makes glad the city of God."  That is, they were directed toward Jerusalem and the temple there, where God lived among his people.

But now that Jesus has come and revealed himself to be the true temple and the true source of life-giving water, we understand that peace with God is found in Jesus.  

And so here's the comfort for us all: in Jesus Christ and the Church, our God is a very present help for us in all our troubles. The community of the faithful, gathered around God's Word, is a stronghold that keeps us safe and sheltered from all of life's turmoil.