Warren Buffett on investment success

“In my opinion, investment success will not be produced by arcane formulae, computer programs or signals flashed by the price behavior of stocks and markets. Rather an investor will succeed by coupling good business judgment with an ability to insulate his thoughts and behavior from the super-contagious emotions that swirl about the marketplace.” – Warren Buffett in his letter (dated February 29, 1988 for FY1987) to Berkshire Hathaway shareholders.