Here is another great quote from Ben’s blog:
Every idea seems like a great idea when you only think it half way through. Once people get half way, they usually begin to give up as they see more problems with the solution than they saw with the original problem. Those who think through things thoroughly don’t end up with a great idea. They end up with a solution.Pet Peeving: Half way there, Mar 2009
You should read the whole article.