Learning from your customers is vital to your success. Even if you work in a back office or don't deal directly with the public, you are serving someone in your job. You have a boss--and the boss is really your customer, right? You have to think of the people you work for (and if you have a job, your work for someone) as customers. Doing so gives you greater buy-in to the idea that your job is part of a bigger universe--it's not just you toiling away on a computer making sure the numbers add up (or whatever it is you do). Someone, somewhere, is counting on you to hold up your end of the bargain and to do your job better, and you can learn from that person (or people).