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And when he wished to cross to Achaia, the brothers encouraged him and wrote to the disciples to welcome him. When he arrived, he greatly helped those who through grace had believed, for he powerfully refuted the Jews in public, showing by the Scriptures that the Christ was Jesus.

Acts 18:27-28

I love the account of the ministry of Apollos and how God used the Ephesian church to mature him into a vibrant evangelist and Christian leader. He represents a second generation and maybe really a third generation leader who was intentionally discipled in the church. He was already a gifted speaker, eloquent and competent in handling scripture when he came to Ephesus (see Acts 18:24). He had believed in Jesus and loved to share about Him to Jews in the Ephesian synagogue. But his understanding of baptism was limited, knowing only about how John the Baptist baptized people. Priscilla and Aquila lovingly took the time to gently disciple and instruct him further and he humbly learned more accurately from them.

The Ephesian Christians undertook support of Apollos and his unique ministry to Jews in Gentile settings. They enthusiastically support his trip to Achaia where he helped strengthen the church there while simultaneously evangelizing in the Jewish community. 

Because Paul made disciples well in Ephesus, they could make a strong leader even better when they met Apollos. And in turn Apollos made disciples well in Achaia. Disciples make disciples who make disciples. That is Christian ministry in summary and it is always the call of the church.