Happiness emerges through both acceptance and advancement. People are just as happy when they give up as when they accomplish something great.
Mediocrity and greatness are just different priorities. You’ll be happiest when your value is in what you do best, or better than most, without a deduction in quality. And you’ll be equally happy consuming the services of others because they save you time and effort. The tradeoff between input and output makes the system work.
Happiness is ultimately tied to what you do and what you can ignore. You control your intentions and what's on your mind. Meanwhile, inactivity and jealousy just complicate happiness. The happiest people seem to live the simplest lives.