I first saw this blog post from Joe the Peacock a few weeks ago. The link was posted to google+ and I decided to sit on it for a while before seeing if I could get it going again.
From the post,
It is important. In fact, I think it’s one of the more important things you can learn, and it’s sad that most of us have to learn it ourselves, the hard way, and experience a lot of pain until we do.