John Chrysostom : And the keeper of the prison awaking out of his sleep, and seeing the prison doors open, drew out his sword, and would have killed himself, supposing that the prisoners had been fled. The keeper was not an evil-disposed man that he thrust them into the inner prison, was because of his having received such a command, not of himself. The man was all in a tumult of perturbation. — Homily on Acts 36 Oecumenius : "The jailer, becoming wise." This is Stephanus, whom Paul mentions in his First Letter to the Corinthians. (1 Cor. 1:16) — Commentary on Acts