“For you yourselves know, brothers and sisters, about our coming to you—it has not proven to be purposeless.”
1 Thessalonians 2.1
When the gospel is preached, God brings forth fruit. The truth is not without effect. Paul recalled the conversion of the Thessalonians. His work among them was the best answer to critics who charged him with disinterest or hidden motives.
How does our work show our purpose and motives? How can you be sure that the gospel will bear fruit?