The following is a song by Ron Hamilton that he wrote in 1978 when he has just lost one of his eyes to cancer.  Through that suffering God has blessed him with a ministry to share the gospel through music.  It is based on Philippians as is an encouragment and reminder that God has a purpose in suffering and we should rejoice!

God never moves without purpose or plan
When trying His servant and molding a man.
Give thanks to the LORD though your testing seems long;
In darkness He giveth a song.

Chorus
O Rejoice in the LORD
He makes no mistake,
He knoweth the end of each path that I take,
For when I am tried
And purified,
I shall come forth as gold.

I could not see through the shadows ahead;
So I looked at the cross of my Savior instead.
I bowed to the will of the Master that day;
Then peace came and tears fled away.

Now I can see testing comes from above;
God strengthens His children and purges in love.
My Father knows best, and I trust in His care;
Through purging more fruit I will bear.