Speak With Your Face

Im constantly amazed at the number of times I run across salespeople who clearly dont believe what theyre saying. It is easy to spot in the persons face and body language. They take on a whole host of non verbals, ranging from non expressive smiles with tight lips to eyes that lack any sense of direction.
When were selling to a customer in person or on the phone, we have to make sure our entire face reflects the enthusiasm and excitement of our words. Why would we expect a person to buy from us if were not connected to and excited about what were selling?