Another good post @hilarski... think I'll resteem this one.
Bottom line for me-- if you have the power of positive focused intention, you can get what you want. And if you believe you'll succeed, you most likely will... and if you believe you'll fail, you most likely will. Not suggesting determination is a substitute for common sense and some wisdom... but I've certainly seen more people succeed with an "average" idea and a lot of determination than people with a "great" idea and a slacker attitude.
That has always been my approach. I know I am not the smartest person in the world but I have a ton more passion than most people.