What does 1 Thessalonians 2:19 mean?

After all, when Jesus comes back, what will make us proud and joyful? What will we point to as our hope and our reward? It’s you. 1 Thessalonians 2:19 - Modern Text Bible

(Paul is saying that the Thessalonians themselves are his greatest achievement and joy—seeing their faith is what he’ll be most proud of when Jesus returns.)