The surest way for a salesman to arouse and keep up the interest of the prospect is to have a genuine interest in it himself. No matter how many times he has gone over the same ground, the salesman must not let the demonstration become an old story and so recite in a half-hearted, hum drum manner. Always demonstrate as if the goods were as new and wonderful to you as they are to your listener. Make every demonstration enthusiastic and fresh. This can be done, but it will require you to be always at your best and full of genuine love for your work.