Umm... the details are in the blog post.
But anyways, here it is:
Don’t let numbers bother you. Hey, NO, I’m not telling you to ignore one of my favorite subjects which is Math! I’m just telling you that if you’re a bit disappointed with your scores (let’s say… your site’s search engine ranking or perhaps its PageRank *ahem, ahem*), don’t make a big fuss out of it. Just move on and work hard to achieve your goals.