I asked my good friend the other day why there is always some constant struggle that we're all dealing with. Why it seems that no day can pass without us feeling some sort of sadness, anger, remorse, angst, or other negative feelings.
And she responded by saying that if we didn't have all that, then we wouldn't know what happiness would be because we'd have nothing to contrast it to.
She is so wise. And that seems like such a simple statement; I should have known all along.