That in order to be good at selling, you have to first fall in love with what you do. "You don't sell your product, because every product in the world has some validity, and there is another product out there that will satisfy the customer's need just as well." What quality do successful salespeople have that others don't? According to Dyer, the answer is serenity. They work for the customer's quota, not the quota their companies set. They're always asking, "How can I serve you?" Whether making a presentation, following up with customers, prospecting, networking, or closing, the difference between your average performer and your top performer will always be enthusiasm.