Imagine what it would feel like, taste like, and smell like to believe you don't have to prove who you are by your accomplishments and labor...The culture we live under does not point you toward this deep truth. It instead has told you and reinforced the idea that you came into the world to be a machine, to accomplish, to labor, and to do. Nothing can be further from the truth and when you slowly begin to believe and understand your inherent worth, rest becomes possible in many ways.
What do we do with suffering? As far as I can see, we have two choices — we either transform our suffering into something else, or we hold on to it, and eventually pass it on.
In order to transform our pain, we must acknowledge that all people suffer. By understanding that suffering is the universal unifying force, we can see people more compassionately, and this goes some way toward helping us forgive the world and ourselves. By acting compassionately, we reduce the world's net suffering and defiantly rehabilitate the world. It is an alchemical act that transforms pain into beauty. This is good. This is beautiful.
To not transform our suffering and instead transmit our pain to others,...compounds the world's suffering. Most sin is simply one person's suffering passed on to another. This is not good. This is not beautiful.
The utility of suffering, then, is the opportunity it affords us to become better human beings. It is the engine of our redemption.