If you don’t feel comfortable making a rough estimate of the asset’s future earnings, just forget it and move on. No one has the ability to evaluate every investment possibility. But omniscience isn’t necessary; you only need to understand the actions you undertake.

The first rule is not to lose. The second rule is not to forget the first rule.

The fundamental basis of above-average performance in the long run is sustainable competitive advantage.

At this point, when treasury bills, seven day treasury bills at 1/20th of one percent, it's not because people want to earn 1/20th of one percent, it's because they trust the fact the treasury will give it back to them next week.

Always invest for the long term.

I do know that when I am 60, I should be attempting to achieve different personal goals than those which had priority at age 20.

Investors, of course, can, by their own behavior make stock ownership highly risky. And many do. Active trading, attempts to "time" market movements, inadequate diversification, the payment of high and unnecessary fees to managers and advisors, and the use of borrowed money can destroy the decent returns that a life-long owner of equities would otherwise enjoy. Indeed, borrowed money has no place in the investor's tool kit.