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. He has told us that you always have pleasant memories of us and that you long to see us, just as we also long to see you.
1 Thessalonians 3:5-6//

Sometimes, I worry that my ministry is in vain. But, I should be encouraged by those that God has granted to be touched by Him through my life.