Selling, in particular, can be a challenge; many investors are tempted to become more optimistic when a security is performing well. This temptation must be resisted; tax considerations aside, when a security reaches full valuation, there is no longer a reason to own it.
Seth KlarmanBecause investors are not usually penalized for adhering to conventional practices, doing so is the less professionally risky strategy, even though it virtually guarantees against superior performance.
Seth KlarmanThe cost of performing well in bad times can be relative underperformance in good times.
Seth KlarmanWe are not so brazen as to believe that we can perfectly calibrate valuation; determining risk and return for any investment remains an art not an exact science
Seth KlarmanTo achieve long-term success over many financial market and economic cycles, observing a few rules is not enough. Too many things change too quickly in the investment world for that approach to succeed. It is necessary instead to understand the rationale behind the rules in order to appreciate why they work when they do and don't when they don't.
Seth Klarman