Then the deputy, when he saw what was done, believed, being astonished at the doctrine of the Lord.

People's New Testament

13:12 Then the deputy... believed. The language implies that he became a Christian. The believers were those who accepted Christ.

Wesley's Notes

13:12 Being astonished at the doctrine of the Lord - Confirmed by such a miracle.

Jamieson-Fausset-Brown Bible Commentary

12. Then the deputy, when he saw what was done, believed, being astonished at the doctrine of the Lord-so marvellously attested; compare Mr 1:27. What fruit, if any, followed this remarkable conversion, or how long after it the missionaries remained at Paphos, we know not.

Matthew Henry's Concise Commentary

13:4-13 Satan is in a special manner busy with great men and men in power, to keep them from being religious, for their example will influence many. Saul is here for the first time called Paul, and never after Saul. Saul was his name as he was a Hebrew; Paul was his name as he was a citizen of Rome. Under the direct influence of the Holy Ghost, he gave Elymas his true character, but not in passion. A fulness of deceit and mischief together, make a man indeed a child of the devil. And those who are enemies to the doctrine of Jesus, are enemies to all righteousness; for in it all righteousness is fulfilled. The ways of the Lord Jesus are the only right ways to heaven and happiness. There are many who not only wander from these ways themselves, but set others against these ways. They commonly are so hardened, that they will not cease to do evil. The proconsul was astonished at the force of the doctrine upon his own heart and conscience, and at the power of God by which it was confirmed. The doctrine of Christ astonishes; and the more we know of it, the more reason we shall see to wonder at it. Those who put their hand to the plough and look back, are not fit for the kingdom of God. Those who are not prepared to face opposition, and to endure hardship, are not fitted for the work of the ministry.