Thousands of people have tried, and the evidence is clear: The more you trade, the less you keep.
Benjamin GrahamMr. Market does not always price stocks the way an appraiser or a private buyer would value a business. Instead, when stocks are going up, he happily pays more than their objective value; and, when they are going down, he is desperate to dump them for less than their true worth.
Benjamin GrahamThere is a close logical connection between the concept of a safety margin and the principle of diversification.
Benjamin GrahamNo matter how careful you are, the one risk no investor can ever eliminate is the risk of being wrong. Only by insisting on what Graham called the "margin of safety" - never overpaying, no matter how exciting an investment seems to be - can you minimize your odds of error.
Benjamin Graham