No statement is more true and better applicable to Wall Street than the famous warning of Santayana: "Those who do not remember the past are condemned to repeat it".

Real investment risk is measured not by the percent that a stock may decline in price in relation to the general market in a given period, but by the danger of a loss of quality and earnings power through economic changes or deterioration in management.

No matter how careful you are, the one risk no investor can ever eliminate is the risk of being wrong. Only by insisting on what Graham called the "margin of safety" - never overpaying, no matter how exciting an investment seems to be - can you minimize your odds of error.

The individual investor should act consistently as an investor and not as a speculator. This means ... that he should be able to justify every purchase he makes and each price he pays by impersonal, objective reasoning that satisfies him that he is getting more than his money's worth for his purchase.

Both individual skill (art) and chance are important factors in determining success or failure.

The intelligent investor shouldn't ignore Mr. Market entirely. Instead, you should do business with him- but only to the extent that it serves your interests.

When somebody asserts that a stock has an earning power of so much, I am sure that the person who hears him doesn't know what he means, and there is a good chance that the man who uses it doesn't know what it means.