A while back (okay, October 2009) I wrote the following post named IYKDWYHBDYWKGWYHBG.
I mentioned that one of the definitions of insanity is doing the same thing over and expecting different results. I bet you've heard some version of that statement before.
Well, the lessons from that post are still valid. I'm not here to recant it or anything. But perhaps bring some more perspective.
Have you also heard the story about the guy who takes a hammer to a rock to break it in half? He hits it 1,000 times in the same place and in the same way. On the 1,000th glance, the rock splits in half. The question is, which blow broke the rock? If you answer the 1,000th blow, then why didn't he just skip the previous 999 blows and hit it that one last time?
Somehow, all of those blows added up to make an imperceptible difference.