1 Thessalonians 3:1-
For this reason, when I could stand it no longer, I sent to find out about your faith. I was afraid that in some way the tempter had tempted you and that our labors might have been in vain.
But Timothy has just now come to us from you and has brought good news about your faith and love.
Therefore, brothers and sisters, in all our distress and persecution we were encouraged about you because of your faith. For now we really live, since you are standing firm in the Lord.
May the Lord make your love increase and overflow for each other and for everyone else, just as ours does for you. May he strengthen your hearts so that you will be blameless and holy in the presence of our God and Father when our Lord Jesus comes with all his holy ones.
Why?
Paul knew news about brothers and sisters in Thessalonians were encouraged and glad to thank the Lord, even though Paul was under distress and persecution, they were encouraged by their faith.
Paul prayed for them for their love to increase, strengthen their heart to be blameless and holy in the presence of God, our Father.
How?
I should pray for my brothers and sisters in my church, that their love to increase, strengthen their hearts to be blameless and holy in the presence of the Lord