The Customer is more than a sale, it is a person to be engaged with as a singular individual.
The Customer is often unaware of what they want. As such, a startup is concerned with running experiments that will help us learn how to build a sustainable business.
The Customer is not to be listened to too closely. If they were asked what they wanted, they'd never have said cars, just faster horses.
A Customer is a relalationship that transcends the exchange of money. The sale is not the end of the relationship with the manufacturer, but the beginning.
The Customer is the axis around which a business turns. If they are having a problem, it is the company's problem.
The Customer is to be come against so closely that you can tell them what they need well before they realize it themselves.