My first thought was depression. Which, I think happens all too frequently, in prison. But, I agree with Smiley. Keep writing. He is going to have to snap out of it, probably by himself. In the meantime, it may help for him to know that someone cares and is there to listen and offer support.

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Live simply, love generously, care deeply, speak kindly.

Cowards are cruel, but the brave love mercy.