"Blessed is God who lives forever, and blessed is his kingdom." (Tobit 13:1)
Tobit prays a great hymn of praise: Blessed is God who lives forever, and blessed is his kingdom. He afflicts and he shows mercy; he leads down to the depths of the underworld, and he leads up from the great abyss. No one can escape his hand. Give thanks to him, you Israelites, before the nations, for he has scattered you among them. He has shown you his greatness even there. He speaks of the exile as God's discipline and the restoration as God's mercy: God afflicted them for their iniquities and will again show mercy; he will gather them from all the nations where they have been scattered. He addresses Jerusalem directly: rejoice and be glad for the sons of the righteous; for they will be gathered together and will praise the Lord of the ages.
The Catechism identifies Tobit's hymn as the prayer of the exile who has learned to praise God in the darkness: the acknowledgment that the same hand that afflicts is the hand that shows mercy, and that therefore the affliction is not the final word (CCC 2586).
Brothers and sisters, he afflicts and he shows mercy. Tobit praises the same God for both the exile and the restoration because he knows both come from the same hand. The faith that can only praise God in the good times has not yet understood who God is. Praise him for the affliction and the mercy together.
Lord God, blessed are you who live forever. You afflict and you show mercy; you scatter and you gather. We praise you for both. Through Christ our Lord. Amen.