David Copperfield by Charles Dickens Chapter 61 Page 18

so that no one man in confinement there, knew anything about another; and the reduction of prisoners to a wholesome state of mind, leading to sincere contrition and repentance.

Now, it struck me, when we began to visit individuals in their cells, and to traverse the passages in which those cells were, and to have the manner of the going to chapel and so forth, explained to us, that there was a strong probability of the prisoners knowing a good deal about each other, and of their carrying on a pretty complete system of intercourse.

This, at the time I write, has been proved, I believe, to be the case; but, as it would have been flat blasphemy against the system to have hinted such a doubt then, I looked out for the penitence as diligently as I could.