Enthusiasm spreads very quick. To change the world, you must spread enthusiasm.
I will tell you why.
To make your customers enthusiastic about your product, your must be 101% enthusiastic about your product.
When presenting before your customer, forget about everything else. Forget your always-angry sales manager. Forget about that customer who did not show up early this morning. Forget about your basketball game tomorrow.
Focus on the customers and be enthusiastic about the benefits and value your product can give them.
You may find this difficult at first. And this will still be difficult the second, third, fourth, and tenth time around. But you really have to be convinced that you, the changemaker, and your vision and mission is the best for the people you lead.
Your job as a change maker is to spread your enthusiasm to others. You can change the world, little by little.