2:1 For you yourselves know, brothers, that our coming to you was not in vain. 2 But though we had already suffered and been shamefully treated at Philippi, as you know, we had boldness in our God to declare to you the gospel of God in the midst of much conflict. 3 For our appeal does not spring from error or impurity or any attempt to deceive, 4 but just as we have been approved by God to be entrusted with the gospel, so we speak, not to please man, but to please God who tests our hearts. 5 For we never came with words of flattery, as you know, nor with a pretext for greed—God is witness. 6 Nor did we seek glory from people, whether from you or from others, though we could have made demands as apostles of Christ. 7 But we were gentle among you, like a nursing mother taking care of her own children. 8 So, being affectionately desirous of you, we were ready to share with you not only the gospel of God but also our own selves, because you had become very dear to us.
9 For you remember, brothers, our labor and toil: we worked night and day, that we might not be a burden to any of you, while we proclaimed to you the gospel of God. 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!
Among Thessalonian believers, Paul defended himself against those seeking to mar his reputation by reminding them of the boldness, gratitude, gentleness & sincerity with which he preached the Gospel.
The evidence of his legitimacy was built upon their reception of--not the words of man, but--the Word of God. Their labor of love from within, despite suffering persecution from without, attested to the efficacy of the Gospel. God was at work in their midst through the revelation of Jesus, and this Paul used as testament to why antagonistic Jews were afflicting them just as they had afflicted Christ. Expect affliction, but then an eternal share in His glory!
Are you seeing the Gospel at work through your patient ministration of the Word of God, and love, to those in sin and suffering? If not, why not?