Acts 16:25

But at midnight Paul and Silas were praying and singing hymns to God, and the prisoners were listening to them.

1. Prisons were dark, damp dungeons. But in the middle of the night, Paul and Silas were singing and praying. Not just in their thoughts. They were singing out loud. They were praying so others could hear.

2. The other prisoners were listening to them. They had no other choice. But they also were, I am sure, amazed that these men, who had been beaten and lock up for no major crime - were able to sing and pray.