Ask 10 people, and you'll get 10 different definitions of success. No matter what it means to you, however, true success can never be stagnant-you don't just achieve it once and then keep it for life. To remain successful, you must continue climbing.
In sales, there are two parallel ladders of success, one internal and one external. The first involves regular improvement-learning as much as possible about your profession and product. The second one concerns service-using what you've learned to enhance your ability to serve your customers.