Paul and his co-authors were speaking directly to the Thessalonians in their context, but we've much to learn from these notes. If you suffer for the Gospel in any way as an imitator of Christ, and you've been convinced of the Truth of the Gospel and you know the model that was Paul's life...then the work of the Spirit in the Thessalonians is also at work in you.
So in this verse we see that the Holy Spirit carried the message along from town to town and generation to generation (2 Peter 1:20-21), stirred within them a perseverant heart allowing them to stand firm in the Truth (James 1:2-3), and transformed them into models of Christ-likeness (Philippians 2:13).
The Spirit also brought about joy, one of the key elements in the fruit of the Spirit (Galatians 5:22). He brought joy to the Thessalonians and He brings it to us through the Word here and now. He is the embodiment of it and is given to all disciples of Christ. No disciple can be a fully functioning imitator of Jesus without also experiencing His supernatural joy.
Joy frees us from the trap of self-esteem, depression, circumstance and suffering...and this only comes from the divine power of the Spirit.
So, be imitators of Christ.
The Thessalonians were transformed by the Gospel and their new lives were models to those who knew of them. How about your life?