Acts 18:26

‘And he began to speak boldly in the synagogue. But when Priscilla and Aquila heard him, they took him to them, and expounded to him the way of God more accurately.'

In God's goodness he began to proclaim his teaching in the synagogue in Ephesus which was attended by Priscilla and Aquila. When they heard what he had to say they took him to one side and updated his teaching, explaining to him ‘the way of God more accurately'. In other words they filled him in on what was lacking in his teaching through lack of knowledge, telling him about the death of Jesus as Messiah, and His resurrection and enthronement through which men could be saved and as a result of which He had sent the full blessing of the poured out Holy Spirit. And he seemingly responded to such an extent that the Ephesian believers then felt able to recommend him to the churches in Achaia.

We may see in all this a re-enactment of John's ministry and its blossoming into the full revelation of Jesus Christ.

For ‘the way of God' compare Matthew 22:16 where it refers to the teaching of Jesus, Mark 12:14 where it refers to the teaching of Jesus as paralleled with the idea of the best of Jewish teaching, and Luke 20:21 where it very much emphasises the special nature of Jesus' teaching. It does not directly appear in the Old Testament, but compare ‘the way of holiness' (Isaiah 35:8). We must also keep in mind the description of Christianity as ‘the Way' (compare Acts 16:17; Acts 19:9; Acts 22:4; Acts 24:22)