I feel that Carnegie's advice can still be followed today to ensure success among today's business leaders. I do not agree with his quote that you should never complain or criticize because if you do not, you will be walked all over and taken advantage of-and that applies to everyone, not just those who want to be successful in the business world. His two other quotes are extremely accurate, though. As a marketer and a promoter of your company, it's not always about catering to people's needs. Sometimes, the measure of your success, is whether or not you can take your products or services and make your customer believe that that is what he/she needs. Of course you have to appeal to your customer's desires-otherwise, there would be no customers.