In your career you will have the opportunity to work with a broad range of clients. Some will help you make a lot of money. Some will help you make a little money. Some will help you grow old friendships. Some will help you make new friendships. Some will be strictly business. And some will be a party. Some will enable you to do great work. Some will help you make a difference. Some will build your confidence. Some will test your limits. Some will cost you money. Some you will love. And some, you will wish you never met. But if you pay attention, they will all help you grow smarter, stronger and more capable. So on the toughest days with the toughest clients, and the best days with the best clients, don’t forget to learn.