The following paragraph was taken from http://www.freetoasthost.org/Enthusiasm.html, a website for Toastmaster Clubs world-wide:
"Enthusiasm will empower you to do just about anything you want, but most of all it will help you do it exceptionally well. The feeling of enthusiasm has amazing effects on the physical body as well. Voice, posture, heart rate and energy, to name a few, are all positively affected when one is filled with enthusiasm. Those around you easily detect this enthusiasm. When another finds you enthusiastic about something, it is difficult for that person not to share some of your enthusiasm. This is incredibly important when selling a product, service, or idea to others. With enthusiasm, your success rate increases phenomenally."
"Enthusiasm makes the difference"
Dr. Norman Vincent Peale