“It takes a man a long time to learn all the lessons of all of his mistakes. They say there are two sides to everything. But there is only one side to the stock market; and it is not the bull side or the bear side, but the right side. It took me longer to get that general principle fixed firmly in my mind than it did most of the more technical phases of the game of stock speculation.”
Source : Edwin Lefevre (2017). “Reminiscences of a Stock Operator (Harriman Definitive Editions): The classic novel based on the life of legendary stock market speculator Jesse Livermore”, p.40, Harriman House Limited