This was Friday's reading (I was not near a computer Friday/Saturday). So here are some observations:
Remember that Paul had to leave Thessalonika in a hurry and was sent off to the south to the city of Athens (see Acts 17). In his hurry to leave there was much left undone in terms of training leaders and encouraging the church. Thus he has deep concern for the stability of the congregation. In order to check on the congregation he sent Timothy to check on the Thessalonian church. In Chapter 3 Paul reports Timothy's report that the church is thriving, that there were no hard feelings and that everyone is praying for everyone else. He concludes with a blessing and a prayer for the church.