A few weeks ago I wrote about customer service and how we use customer support data to fine-tune ShortStack.com's software. In that column, I included one of my favorite quotes from Southwest Airlines' Herb Kelleher, but I was also motivated to look around for some other quotes about customer service.

Here are 21 quotes from business magnates, first ladies and political leaders. that reinforce how important customer service is for anyone who is interested in running a profitable business.

1. "The purpose of business is to create and keep a customer." ~ Peter Drucker

2. "It it not the employer who pays the wages. Employers only handle the money. It is the customer who pays the wages." ~ Henry Ford

3. "Spend a lot of time talking to your customers face to face. You'd be amazed how many companies don't listen to their customers." ~ Ross Perot

4. "Your most unhappy customers are your greatest source of learning." ~ Bill Gates

5. "Quality is more important than quantity. One home run is much better than two doubles." ~ Steve Jobs

6. In the world of internet customer service, it's important to remember your competitor is only one mouse click away." ~ Doug Warner

7. "A customer is the most important visitor on our premises. He is not dependent on us, we are dependent on him. He is not an interruption in our work, he is the purpose of it. He is not an outsider in our business, he is part of it. We are not doing him a favor by serving him. He is doing us a favor by giving us an opportunity to do so." ~ Mahatma Gandhi

8. "Make your product easier to buy than your competition or you will find your customers buying from them, not you." ~ Mark Cuban

9. "We see our customers as invited guests to a party, and we are the hosts. It's our job every day to make every important aspect of the customer service experience a little better." ~ Jeff Bezos

10. "The purpose of a business is to create a customer who creates customers." ~ Shiv Singh

11. "Whether you are big or small, you cannot give customer service if your employees don't feel good about coming to work." ~ Martin Oliver

12. "There are no traffic jams along the extra mile." ~ Roger Staubach

13. "Customer service is an opportunity to exceed your customer's expectations." ~ John Jantsch

14. "A man without a smiling face must not open a shop." ~ Chinese Proverb

15. "Don't find fault. Find a remedy." ~ Henry Ford

16. "Do right. Do your best. Treat others as you want to be treated." ~ Lou Holtz

17. "If you work just for money, you'll never make it, but if you love what you're doing and you always put the customer first, success will be yours." ~ Ray Kroc

18. "Nothing is so contagious as enthusiasm." ~ Samuel Taylor Coleridge

19. "Be helpful, even if there's no immediate profit in it." ~ Susan Ward

20. "Customer service is limited to one department, it's everyone's job." ~ Jim Belosic

which leads me to:

21. "It's not fair to ask of others what you are not willing to do yourself." ~ Eleanor Roosevelt

What are some customer-service words of wisdom you live by? Please share in the comments below.