An excerpt from Creating, by Robert Fritz. This is from chapter 15, "Long-Term Creating," a chapter that deals specifically with goal-setting:
(Emphasis his.)The one ingredient you don’t need is determination. I am tired of hearing all the motivational speakers attempt to goose their audiences into the ranks of the determined. If you must muster determination to create what you want, you are going about it all wrong. Great musicians do not use determination to develop their skills, nor do great athletes, nor do great actors, nor do great inventors, nor do great scientists, nor do great furniture designers. Determination is for people who are not very good at what they do. Determination is a short-term motivational manipulation that is designed to overcome inertia, procrastination, and ineptitude. The power of determination runs out awfully fast. That’s why those who attempt to instill themselves with determination need to continually bombard themselves with motivational tapes and books. You cannot build momentum based on determination or through other forms of willpower manipulation.
Etch that phrase into your shaving mirror so you see it every morning: "Determination is for people who are not very good at what they do."