Investing is the intersection of economics and psychology. The analysis is actually the easy part. The economics, the valuation of the business isn't that hard. The psychology - how much do you buy, do you buy it at this price, do you wait for a lower price, what do you do when it looks like the world might end - those things are harder. Knowing whether you stand there, buy more, or whether something has legitimately gone wrong and you need to sell, those are harder things. That you learn with experience, by having the right psychological makeup.
Seth KlarmanBe indifferent if you lose your short term clients, remember they are your own worst enemy
Seth KlarmanIf you've just stared into the abyss, quickly forget it: the lessons of history can only hold you back.
Seth Klarman