You have to invest the way that's comfortable for you.
Earnings can change dramatically. Usually assets change slowly.
I was in Graham's office the day he bought GEICO. Warren owns one-third of the stock today.
You know, people tend to like to buy companies that are doing well.
Try not to let your emotions affect your judgement.
Before selling, try to re-evaluate the company again and see where the stock sells in realtion to its book value.