Colin Adams looks at what Paul is saying to the Thessalonians in this passage. He explains it under three headings.
The Thessalonians were in a situation they didn’t understand, so they were lacking hope.
Paul supplies the information they need to comfort them and restore their hope.
Those who believed that information received comfort. The comfort didn’t abolish tears, but it did bring hope. Having been comforted, they must bring that comfort to others.