When he went back to Ephesus, Paul spent three months preaching in the synagogue. One commentary notes, "Three months in a synagogue without a riot is something of a record for Paul." Which is kind of funny, but it may simply be evidence of the Holy Spirit working in his life, helping him to grow in love, joy, peace, patience, gentleness, kindness, goodness, faithfulness, and self-control.
Today, as we return to the book of Acts, we should all be asking the question Paul asked a group of men he met with when he got back to Ephesus: Did you receive the Holy Spirit when you believed? Well, did you? How would you know? Could others tell? Could you go three months without a riot if you were talking about your faith every day?
If you didn't receive the Holy Spirit, what WERE you baptized into? Because it wasn't Jesus.