At times of sorrow we can find comfort from God if we pray to him. But it is true that God may be testing us at such times in the hope that our characters will be strengthened by the things that we suffer. Paul was able to say
For the sake of Christ, then, I am content with weaknesses, insults, hardships, persecutions, and calamities. For when I am weak, then I am strong. (2 Corinthians 12:10)
And Peter says to the followers of Christ
Beloved, do not be surprised at the fiery trial when it comes upon you to test you, as though something strange were happening to you. But rejoice insofar as you share Christ’s sufferings, that you may also rejoice and be glad when his glory is revealed. (1 Peter 4:12-13)