Suddenly; how soon is prayer answered, when the fulness of time is come! So nigh is God unto all that call upon him, Psalms 34:17, Psalms 145:18. There was a great earthquake; an earthquake did usually precede some wonderful matter, as Matthew 28:2. And although God could have delivered these his servants without an earthquake, yet, to show the more that their deliverance was his work, and it was no artifice or force of their own, he manifested his power after this manner. Every one's bands were loosed; either by the earthquake, or some secret power of an angel, or by God himself immediately, that the apostles and others might know that the souls of men should be loosed and set free by them, whose bodies for that purpose were now freed by God.
Related Commentaries of Acts 16:26
Acts 16:26
26 And suddenly there was a great earthquake, so that the foundations of the prison were shaken: and immediately all the doors were opened, and every one's bands were loosed.