Now, of course, it should be said that there is nothing intrinsically ennobling about suffering. Just as failure is sometimes just failure (and not your path to becoming the next Steve Jobs) suffering is sometimes just destructive, to be exited as quickly as possible.
But some people are clearly ennobled by it. Think of the way Franklin Roosevelt came back deeper and more empathetic after being struck with polio. Often, physical or social suffering can give people an outsider’s perspective, an attuned awareness of what other outsiders are enduring.
But the big thing that suffering does is it takes you outside of precisely that logic that the happiness mentality encourages. Happiness wants you to think about maximizing your benefits. Difficulty and suffering sends you on a different course.
First, suffering drags you deeper into yourself. The theologian Paul Tillich wrote that people who endure suffering are taken beneath the routines of life and find they are not who they believed themselves to be. The agony involved in, say, composing a great piece of music or the grief of having lost a loved one smashes through what they thought was the bottom floor of their personality, revealing an area below, and then it smashes through that floor revealing another area.