Value investors will not invest in businesses that they cannot readily understand or ones they find excessively risky. Hence few value investors will own the shares of technology companies. Many also shun commercial banks, which they consider to have unanalyzable assets, as well as property and casualty insurance companies, which have both unanalyzable assets and liabilities.

When excesses such as lax lending standards become widespread and persist for some time, people are lulled into a false sense of security, creating an even more dangerous situation. In some cases, excesses migrate beyond regional or national borders, raising the ante for investors and governments. These excesses will eventually end, triggering a crisis at least in proportion to the degree of the excesses. Correlations between asset classes may be surprisingly high when leverage rapidly unwinds.

Value investing is risk aversion.

If you are predisposed to be patient, disciplined and psychologically appreciate the idea of buying bargains, then you're likely to be good at it. If you have a need for action, if you want to be involved in the new and exciting technological breakthroughs of our time, that's great, but you're not a value investor, and you shouldn't be one.

Successful investors like stocks better when they’re going down. When you go to a department store or a supermarket, you like to buy merchandise on sale, but it doesn’t work that way in the stock market. In the stock market, people panic when stocks are going down, so they like them less when they should like them more. When prices go down, you shouldn’t panic, but it’s hard to control your emotions when you’re overextended, when you see your net worth drop in half and you worry that you won’t have enough money to pay for your kids’ college.

It is important to remember that value investing is not a perfect science. It is an, with an ongoing need for judgment, refinement, patience, and reflection. It requires endless curiosity, the relentless pursuit of additional information, the raising of questions, and the search for answers. It necessitates dealing with imperfect information - knowing you will never know everything and that that must not prevent you from acting. It requires a precarious balance between conviction, steadfastness in the face of adversity, and doubt - keeping in mind the possibility that you could be wrong.

If you've just stared into the abyss, quickly forget it: the lessons of history can only hold you back.