How to have great posts

Seth Godin says that he writes at least three posts for every one that makes it to his blog. Throwing away the other two away allows him to have a blog of bests. I haven't ever thought of doing something like that, it has been hard enough for me to write enough to even post once per day. But I actually do something very similar with photography. After taking 380 photos over the weekend I eliminated 365 of those photos before sharing the remaining 15. And the process, while hard, is satisfying in the end.