The strategy of buying what's in favor is a fool's errand, ensuring long-term underperformance. Only by standing against the prevailing winds - selectively, but resolutely - can an investor prosper over time. But for a while, a value investor typically underperforms.

Here’s how to know if you have the makeup to be an investor. How would you handle the following situation? Let’s say you own a Procter & Gamble in your portfolio and the stock price goes down by half. Do you like it better? If it falls in half, do you reinvest dividends? Do you take cash out of savings to buy more? If you have the confidence to do that, then you’re an investor. If you don’t, you’re not an investor, you’re a speculator, and you shouldn’t be in the stock market in the first place.

Why should the immediate opportunity set be the only one considered, when tomorrow's may well be considerably more fertile than today's?

Speculators are obsessed with predicting: guessing the direction of stock prices. Every morning on cable television, every afternoon on the stock market report, every weekend in Barron's, every week in dozens of market newsletters, and whenever business people get together. In reality, no one knows what the market will do; trying to predict it is a waste of time, and investing based upon that prediction is a purely speculative undertaking.

I find value investing to be a stimulating, intellectually challenging, ever changing, and financially rewarding discipline

The single greatest edge an investor can have is a long-term orientation.

Investors should pay attention not only to whether but also to why current holdings are undervalued. It is critical to know why you have made an investment and to sell when the reason for owning it no longer applies. Look for investments with catalysts that may assist directly in the realization of underlying value. Give reference to companies having good managements with a personal financial stake in the business. Finally, diversify your holdings and hedge when it is financially attractive to do so.