1 Thessalonians 2:19
For what [is] our hope, or joy, or crown of rejoicing? [Are] not even ye in the presence of our Lord Jesus Christ at his coming?
Note 10 at 1Th 2:19: The New International Reader's Version translates 1Th 2:19-20 in the following way: "What is our hope? What is our joy? When our Lord Jesus returns, what is the crown we will delight in? Isn't it you? Yes, you are our glory and our joy."
Note 11 at 1Th 2:19: Paul was doing what he was doing because of his love for God and his love for people. He wasn't in it just for himself. What blessed him the most in this life was seeing people receive Jesus and become mature believers in Him. That's what he was referring to here.