I have many years experience with all aspects of Excel, including VBA and I understood Excel better than anyone else I knew. At one stage I had the arrogance to

I have many years experience with all aspects of Excel, including VBA and I understood Excel better than anyone else I knew. At one stage I had the arrogance to think of myself as an expert in Excel. Fortunately, I changed companies to work at a hedge fund and realized, with some shock, that I was very far from an expert in Excel. Those guys were doing things with Excel that made my jaw drop. I had got complacent and thought I knew everything that was worth knowing. The funny thing was that this was not the first time this had happened to me. I underwent a very similar experience with C programming. I had read all the books, thought I understood everything there was to know about the language, then got exposed to some real C experts at a small high-tech company. That was a humbling experience as well. Needless to say, after getting humbled twice, I will be very careful before I ever call myself an expert at anything in the future!