The most valuable thing I took out of prison was the absolute certainty that I never wanted to go back. That sounds simple, but it is more powerful than it might seem. When that conviction is real and not just something you say, it changes how you make decisions on the outside in ways that are hard to explain until you have lived it.
The deeper lesson came from having enough time and enough quiet to look honestly at the patterns in my own thinking that led me there in the first place. Prison strips away the noise and the distractions and leaves you alone with yourself in a way that is uncomfortable but clarifying if you are willing to sit with it. What I found was a habit of taking shortcuts. Not dramatic ones necessarily, but a consistent tendency to find the easier path, the faster route, the way around rather than through. That thinking compounds over time and eventually it catches up. The moment it does is the moment you realize how far you have drifted from where you should be.
The real work of incarceration, for the people who do it honestly, is changing the thinking before you get out. The circumstances change when you walk out the gate. The thinking has to change before that, or the circumstances eventually lead back to the same place.
On pen pals, yes, and I would encourage anyone considering it to follow that instinct. Writing to someone inside, and receiving letters back, creates a genuine human connection across an enormous divide. For the inmate, it is a reminder that the world has not forgotten them. For the person writing, it is often something they did not expect to find. Send the letter.