It's human nature to keep doing something as long as it's pleasurable and you can succeed at it, which is why the world population continues to double every 40 years.

When you start to confuse Freddie Mac, Sallie Mae and Fannie Mae with members of your family, and you remember 2,000 stock symbols but forget the children's birthdays, there's a good chance you've become too wrapped up in your work.

The best stock to buy is the one you already own.

Bargains are the holy grail of the true stockpicker. The fact that 10 to 30 percent of our net worth is lost in a market sell-off is of little consequence. We see the latest correction not as a disaster but as an opportunity to acquire more shares at low prices. This is how great fortunes are made over time.

All the math you need in the stock market you get in the fourth grade.

Owning stocks is like having children - don't get involved with more than you can handle.

Spend at least as much time researching a stock as you would choosing a refrigerator.