From bad things come good things. Every action has a reaction.
I was pondering the idea of mantras recently. I wondered what mine was. I gave it some thought, and a recurring, similar thought I seem to have when things don't go my way seems to be "Good things always come from bad things." So I suppose that's my mantra.
Is "good things always come from bad things" a logical statement though? It would seem so. If you cut your head falling off a bike without a helmet, you learn to wear a helmet next time. That's good. If your relationship failed due to a problem, you can go into the next relationship stronger and wiser. That's good. Hell, even a terrorist attack brings a community closer together.
I wonder if you could say that good and bad are equal and opposite. It would imply that bad things come from good things, too. Is there a bad reaction if a man and a woman nearly perfect for one another get married and live happily-ever-after?
Who knows.