DOG NAMED SALESMAN
Two guys used to go duck hunting with each other. They didn't have a dog of their own so they used to go to the same blind and same location all the time and rented a dog, a retriever from a man who owned the blind. After a while they found a dog that gave them particularly good results from the owner so they requested him all the time. The dog's name was Salesman and they used him for a few years. Once they went back on a trip and he wasn't available. He was promoted and the owner told them: "You don't want to use him. His name is Sales Manager and all he does is bark at everyone!"
Point: Motivation needs to come from within. Over the long haul a true spirited sense of motivation cannot come from a barking Sales Manager.