In this top-10 list (well, okay, top-13), Harvey Mackay explains how to adopt a sales mindset. As research has shown, success in selling is not related to personal style or charm. My favorites in Mackay’s list are stay hungry, never compromise your integrity, be authoritative (know your products backwards and forwards) and become a customer service fanatic. I attribute much of our growth and accomplishments to our many employees who have these qualities.