27. And when [Apollos] wished to cross to Achaia (most of Greece), the brethren wrote to the disciples there, urging and encouraging them to accept and welcome him heartily. When he arrived, he proved a great help to those who through grace (God's unmerited favor and mercy) had believed (adhered to, trusted in, and relied on Christ as Lord and Savior).
28. For with great power he refuted the Jews in public [discussions], showing and proving by the Scriptures that Jesus is the Christ (the Messiah).