There is always something to worry about. Avoid weekend thinking and ignoring the latest dire predictions of the newscasters. Sell a stock because the company's fundamentals deteriorate, not because the sky is falling.

Never invest in anything that cannot be illustrated with a crayon

If you go to Minnesota in January, you should know that it's gonna be cold. You don't panic when the thermometer falls below zero.

There's no shame in losing money on a stock. Everybody does it. What is shameful is to hold on to a stock, or worse, to buy more of it when the fundamentals are deteriorating.

Investing is fun and exciting, but dangerous if you don't do any work.

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

Investing in stocks is an art, not a science, and people who've been trained to rigidly quantify everything have a big disadvantage.