Selling is essentially transference of feeling.
You never know when a moment and a few sincere words can have an impact on a life.
The way you see people is the way you treat them.
Among the things you can give and still keep are your word, a smile, and a grateful heart.
Everyone, including you, just naturally feels better when exposed to a cheerful, optimistic individual, regardless of the nature or length of the contact.
When you do more than you're paid for eventually you'll be paid for more than you do.