neither did we eat bread from anyone's hand without paying for it, but in labor and travail worked night and day, that we might not burden any of you;

 At the end Paul adds his autograph to authenticate his letter. "Look," he says, "this is what my handwriting is like. Mark it, so that you will know it again." And then, with the truth expounded, with praise and rebuke lovingly intermingled, he commends the Thessalonian Church to the grace of the Lord Jesus Christ. 