I agree with Scully and Uzzah, especially:
Any fool will celebrate with you but only a friend will be there when you weep and then weep with you.
I think that real, true friendships take a very long time to nurture and develop. They have to be maintained in order for trust to be established and built upon. I don't believe that as a rule, we have many of those types of friendships in a lifetime and so when we are fortunate enough to acquire one, it's worth most any effort to keep it.
I've heard it said that friendships shouldn't have to be worked at, but I really don't think that's the case. I think that they, like any relationship that's important to us, require effort, time and attention, otherwise what's to keep them from fading away?
As for the above quote from Uzzah, hard times and difficulties are a real measure of true friendship, imo. It doesn't require a great deal of emotional energy to be a friend when things are going well, but how many of us are really there for each other when things get tough? To have a friend, one has to be a friend...trite but true :D
Dana