In my life there are not that many questions I can't properly deal with using my $40 adding machine and dog-eared compound interest table.

Don't confuse correlation and causation. Almost all great records eventually dwindle.

Three rules for a career: 1) Don’t sell anything you wouldn’t buy yourself; 2) Don’t work for anyone you don’t respect and admire; and 3) Work only with people you enjoy.

At most corporations if you make an acquisition and it turns out to be a disaster, all the paperwork and presentations that caused the dumb acquisition to be made are quickly forgotten. You've got denial, you've got everything in the world. You've got Pavlovian association tendency. Nobody even wants to even be associated with the damned thing or even mention it. At Johnson & Johnson, they make everybody revisit their old acquisitions and wade through the presentations. That is a very smart thing to do. And by the way, I do the same thing routinely.

You don't want to be like the motion picture exec who had so many people at his funeral, but they were there just make sure he was dead. Or how about the guy who, at his funeral, the priest said, "Won't anyone stand up and say anything nice for the deceased?" and finally someone said, "Well, his brother was worse."

The idea of excessive diversification is madness.

You can hire your advisor and then just apply a windage factor, like I used to do when I was a rifle shooter. I'd just adjust for so many miles an hour wind. Or you can learn the basic elements of your advisor's trade. You don't have to learn very much, by the way, because if you learn just a little then you can make him explain why he's right.