John Chrysostom
See how Paul exposes himself to dangers: "When I had returned to Jerusalem," he says. That is, after that vision I again came to Jerusalem. But let us return to what was said above. "While I was praying in the temple," Paul says, "I fell into a trance." To show that this was not a phantom of imagination, he adds, "I was praying." See, this too did not remain without testimony, which lies in the event itself. The Lord said, "They will not receive your testimony," and in fact they did not receive it. By every consideration one should have expected them to receive it. They knew that I imprisoned and beat those who believed in You. For this very reason they ought to have received it. Yet they did not receive it.
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Therefore it was revealed to him in a trance that they would not receive the testimony. Here he explains two things. First, they are without excuse, since they persecuted him unjustly and irrationally. Second, Christ is God, since He foretells the unexpected, not looking at the past, but foreseeing the future.