What does 1 Thessalonians 1:8 mean?

The message about the Lord has echoed out from you, not just in Macedonia and Achaia, but everywhere people have heard about your faith in God. We don't even need to say anything about it. 1 Thessalonians 1:8 - Modern Text Bible

(Their reputation for faith has spread so widely that Paul doesn't have to introduce them—everyone already knows.)