"If there is anything I have learned in my travels across the Planes, it is that many things may change the nature of a man. Whether regret, or love, or revenge or fear - whatever you believe can change the nature of a man, can. I've seen belief move cities, make men stave off death, and turn an evil hag's heart half-circle. This entire Fortress has been constructed from belief. Belief damned a woman, whose heart clung to the hope that another loved her when he did not. Once, it made a man seek immortality and achieve it. And it has made a posturing spirit think it is something more than a part of me." - The Nameless One
Dank, as life-affirming as it may feel, you can't just choose the most pleasurable stone in the public Sensorium and gaze into it all day, every day.
At some point, you're going to have to enter the Fortress of Regrets.
That's just how life is.