Paul preached in Thessalonica using his typical strategy of first going to the local synagogue on the Sabbath. There, he used Old Testament prophecies to show that the Messiah was prophesied to suffer before entering into glory. Some Jews and prominent Greeks believed, forming the core of the new church. The church grew to include Gentiles from various classes. Paul's approach demonstrated how to start where people are spiritually and use familiar concepts like the Messiah to share the gospel.