“He (Apollos) began to speak boldly in the synagogue. When Priscilla and Aquila heard him, they invited him to their home and explained to him the way of God more adequately.” Apollos was teaching about Jesus but only knew about the baptism of John. It would seem that he was a disciple of John the Baptist and he left Jerusalem before Pentecost. For it was at Pentecost that Peter proclaimed the keys into the Kingdom, (when one believes) that one must repent and be baptized in the name Jesus Christ for the remission of their sins and you would receive the gift of the Holy Spirit. So when Priscilla and Aquila encounter Apollos they realized that his teaching was not complete and they taught him the way of God more adequately. Often we encounter people who believe in Jesus but they need to be taught the way of God more adequately.