股票會因為許多理由而上漲和下跌，也會毫無來由地上漲或下跌。我們不需要每一次因為股價下跌而懊惱和怪罪自己，也不需要每一次因為股價上漲而覺得自己了不起。

（Stocks go up and down for many reasons and no reason at all. We need not kick ourselves with regret every time stock prices go down, and we should not stroke ourselves with pride every time they go up.）