Rather, risk is a perception in each investor's mind that results from analysis of the probability and amount of potential loss from an investment. If an exploratory oil well proves to be a dry hole, it is called risky. If a bond defaults or a stock plunges in price, they are called risky. But if the well is a gusher, the bond matures on schedule, and the stock rallies strongly, can we say they weren't risky when the investment after it is concluded than was known when it was made.

I think markets will never be efficient because of human nature.

A simple rule applies: if you don't quickly comprehend what a company is doing, then management probably doesn't either.

Gold is unique because it has the age-old aspect of being viewed as a store of value. Nevertheless, it’s still a commodity and has no tangible value, and so I would say that gold is a speculation. But because of my fear about the potential debasing of paper money and about paper money not being a store of value, I want some exposure to gold.

The prevailing view has been that the market will earn a high rate of return if the holding period is long enough, but entry point is what really matters.

To achieve long-term success over many financial market and economic cycles, observing a few rules is not enough. Too many things change too quickly in the investment world for that approach to succeed. It is necessary instead to understand the rationale behind the rules in order to appreciate why they work when they do and don't when they don't.

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.