The best way I’d ever heard it put was by a manager (by his mother, really) while we were having lunch one day (this is when I worked at Comcash a couple years back). He told me his mother always said, “Potential don’t mean shit. There are plenty less capable people out there doing it.” But I really like how you filled it out, “uccess is all about execution. Getting stuff done. Brains, luck, experience, etc just determine your level of success” because it adds to the idea.