Agreed with this completely! And it's also the reason that, just like with punishment, I don't really believe in rewards. The best "rewards" are being able to ride further, climb higher, or having to buy new clothes because you've shrunk out of everything you own. I think that being able to appreciate these less material rewards is better for long-term success at weight loss than buying yourself a new bike or something like that.
The success breeds further motivation and provides support for my willpower. I have never ever felt so focused on achieving a goal like this. I will echo what was said above...nobody here can give you the motivation or the willpower to stick with it...only you can do that, and it will have to come because you don't want to be "the fat guy" any more. When you get tired of being fat and decide you really want to commit to making a change, it will seem easy...almost effortless to stick with it.