1 Thessalonians 2:10-20 (ESV)
10 You are witnesses, and God also, how holy and righteous and blameless was our conduct toward you believers. 11 For you know how, like a father with his children, 12 we exhorted each one of you and encouraged you and charged you to walk in a manner worthy of God, who calls you into his own kingdom and glory.
13 And we also thank God constantly  for this, that when you received the word of God, which you heard from us, you accepted it not as the word of men but as what it really is, the word of God, which is at work in you believers. 14 For you, brothers, became imitators of the churches of God in Christ Jesus that are in Judea. For you suffered the same things from your own countrymen as they did from the Jews, 15 who killed both the Lord Jesus and the prophets, and drove us out, and displease God and oppose all mankind 16 by hindering us from speaking to the Gentiles that they might be saved—so as always to fill up the measure of their sins. But God’s wrath has come upon them at last! 
Paul’s Longing to See Them Again
17 But since we were torn away from you, brothers, for a short time, in person not in heart, we endeavored the more eagerly and with great desire to see you face to face, 18 because we wanted to come to you—I, Paul, again and again—but Satan hindered us. 19 For what is our hope or joy or crown of boasting before our Lord Jesus at his coming? Is it not you? 20 For you are our glory and joy.