This one struck me as a whimsy when I was toodling around the net. It's been a while since I wrote anything and, to be honest with myself, I think it shows. This strikes me as being trite, but I can't quite see how to rework it to avoid that.
Weep for what was,
weep for what will be,
weep for those who knew better,
and most important of all,
weep for what might have been...