Resilience.

I think this is a phenomenal word and concept.

Bad things may happen.  It's what we do with them and how we manage ourselves that matters.  You can not judge or structure yourself by the things that happen to you, they mean nothing.  It's the conscious decisions and actions that you choose that matter.

I even remember reading an NPR story about how the trait of resiliency is one of the things most closely associated with a life expectancy.  Sadly, a quick search couldn't find it, but I found this and it was interesting.