Its probably already blindingly obvious, but i'll say it anyway: the best way to succeed in a venture is to keep plugging away. Never say, "Enough", never give up, never concede defeat.
Too often we lack the conviction and discipline to see things through, to grit our teeth when the going gets tough and to finish the job. Failed marriages, failed businesses, failure in our studies - ever wonder how much more you could have achieved if you had kept at it for another day, another hour, another minute?
My own personal failure involves my inability to write a book. Its something that i've wanted to do since i was 14, and its something that i've tried often enough over the years. Boxes under my desk, drawers in my desk and countless trash bins are full of my manuscripts - every one of them a story that i wanted to deliver from my mind. But i could never finish any, and that is down to a lack of mental discipline.
I may one day yet write a book, but it won't be today, or tomorrow or anytime soon. My personal battle right now lies with my weight. And this is something that i will conquer. I would rather faint or collapse from exhaustion and the lack of food than experience the pleasure of meal that is so often eclipsed by guilt and regret afterwards. Keep at it, keep at it. A mouthful of rice and a scrap of protein is all that is needed to stay alive. Any more would be a breach of discipline.