Apollos was a powerful preacher from Alexandria who taught in the Jewish synagogues. As an itinerant preacher, he was popular, who visited the cities where Jewish Diaspora lived and had a synagogue. Being an eloquent speaker, he was competent in Scripture. He visited the city of Ephesus and spoke in the synagogue. Among the audience were Aquilla and Priscilla. (Acts 18:24-28)
Whole counsel of God: Apollos had profound knowledge of the Scripture, as a disciple of John the Baptist, he knew about the Messiah. However, he did not know that the Messiah is the Lord Jesus Christ. He knew only the baptism of John the Baptist, and did not know the Lamb of God that taketh away the sin of the world. (John 1:29) With the light he had, he was obedient and taught in the synagogues.
Diplomatic: Aquila and Priscilla listened to Apollos. Though they had greater light and understanding about the gospel, they did not show that in public. Neither did they confront Apollos, nor did they argue with him in public. They were humble to reach out to Apollos privately.
Hospitality: Aquilla and Priscilla took Apollos aside. They had a conversation. Apollos was also humble to listen to a professional couple who were tentmakers. He did not think, he knew it all. The couple were well-trained by Paul and were convinced of the gospel; hence, they invited Apollos for a longer discussion in their home. A few days of teaching and hospitality made Apollos become an ardent disciple of the Lord.
References: Aquilla and Pricilla introduced Apollos to other elders of the church in Ephesus. When Apollos travelled to the next destination beyond Achia, they wrote a letter to the disciples to accept him. He was welcomed by the believers, and Apollos powerfully ministered to them and also refuted the Jews in public.
Apostle Apollos: Though he was not of the twelve, he is considered an apostle according to tradition. His ministry had great fruits in the city of Corinth, and Paul valued him as a colleague and co-worker. (I Corinthians 3:6)
Do I diplomatically minister to people and extend hospitality to them?