Amazed

Acts 13:12 ESV

12 Then the proconsul believed when he saw what had happened, being amazed at the teaching of the Lord.

KJV

12  Then the deputy, when he saw what was done, believed, being astonished...

Believing, he was shaken loose from the world's pull, the gravity of self. A new world was opened up, the kingdom of God. He was awaken from the slumber of sin which is death. He felt the sword of the word which can penetrate the hardest of hearts.

[ ppmp G1605 ἐκπλήσσω * ekplēssō * ek-place'-so * From G1537 and G4141; to strike with astonishment: - amaze, astonish. [LEX] Not found. [TGD] ἐκπλήσσω 

ekplēssō 

Thayer Definition: 

1) to strike out, expel by a blow, drive out or away

2) to cast off by a blow, to drive out

2a) commonly, to strike one out of self-possession, to strike with panic, shock, astonish

3) to be struck with amazement, astonished, amazed