Adam Clarke on Acts 17:12

Therefore many of them believed - From the manner in which they heard, received, and examined the word preached to them, it was not likely they could be deceived. And, as it was the truth that was proclaimed to them, it is no wonder that they apprehended, believed, and embraced it.

Of honorable women which were Greeks - Probably mere heathens are meant; and these were some of the chief families in the place. Thus we find that the preaching of Paul at Berea was made the instrument of converting both Jews and Gentiles.