At some point in our lives, we will all face some time of sadness and grief due to sickness, broken relationships, or death. In fact, death is one part of our human existence from which none of us can escape. However, how we respond to it can have a significant impact on how we respond to other problems as well. For me personally, I realize that life isn't always fair, nor is it meant to be. We all must face great disappointments along the way, but if we allow, they can help forge, strengthen, and mold our character as new challenges come along. Furthermore, such trials can help us become more compassionate towards others.
I would much rather be able to choose my problems, but when I can't, I try to accept the fact that such tribulations can help me build great resolve and faith to become a better person.