a remarkable convergence

I am teaching three classes right now, distance-learning style. My students and I are isolated from one another, confined to our homes, denied the free movement we are accustomed to. Oh, and those classes?  

In one we are reading The Pilgrim’s Progress, which John Bunyan began when he was in prison. 
In the second we are reading Bonhoeffer’s Letters and Papers from Prison. 
In the third we are reading letters that St. Paul wrote while in prison. 

How’s that for a convergence? When I planned the semester I never noticed this rhyming of theme — nor, needless to say, did I anticipate that our very lives would be playing the same theme at this moment.