A wonderful quote from Eckhart Tolle’s The Power of Now:
“Do you truly know what is positive and what is negative? Do you have the total picture? There have been many people for whom limitation, failure, loss, illness, or pain in whatever form turned out to be their greatest teacher. It taught them to let go of false self-images and superficial ego-dictated goals and desires. It gave them depth, humility, and compassion. It made them more real [emphasis in the original].
Whenever anything negative happens to you, there is a deep lesson concealed within it, although you may not see it at the time. Even a brief illness or an accident can show you what is real and unreal in your life, what ultimately matters and what doesn’t.”