Read 1 Thessalonians 1:4-7

For when we brought you the Good News, it was not only with words but also with power, for the Holy Spirit gave you full assurance that what we said was true. – 1 Thessalonians 1:5a (NLT)

The Good News is God’s Good News. Thus, when the Good News is preached, with both words and deeds, God’s power also shows up to reveal people’s hearts and bring them to a place of forgiveness and redemption. This can be a force to unify both the community of believers itself, and the believers with the larger community in which they live.