Suffering right now, not just forever, is the result of living out of an unquestioned mind. I don’t have any good examples of why it could be a good thing to suffer at all, anytime, not to mention forever, other than to feel the suffering, identify the thoughts that are causing the suffering and do The Work on the identified concepts that are causing the suffering, and then look forward to any suffering left to show you what hasn’t been dealt with yet, and then do The Work with that.
Also, “forever” implies a future in time, and no one can know for sure what that will bring. In this moment ”now” is the only “real” piece of time available to us. And why can’t this moment be enough suffering? Why must we project this suffering now into an imagined future for more? So to answer your question, “Why could it be a good thing to suffer forever?” So you can do The Work on the idea “I am going to suffer forever” and end your suffering and fear about the future you are believing in now. To do The Work on this idea, to discover that the idea of suffering forever is the cause of your suffering now, could be the end of your fear of the future. Why would someone want to question the idea “I will suffer forever”? Because what this fear is creating is your stressful moment now.
From a newsletter a while back.