Set out to do good work. Set out to be fair in your dealings with customers, employees, and reality. Leave a lasting impression with the people you touch and worry less (or not at all!) about changing the world. Chances are, you won’t, and if you do, it’s not going to be because you said you would.
— It Doesn’t Have to be Crazy at Work
Don’t set out to get to a certain sales figure. That’s ultimately out of your control. Do what you can to make the best thing you can, knowing that you did your best work.