"Though business conditions may change, corporations and securities may change, and financial institutions and regulations may change, human nature remains the same. Thus the important and difficult part of sound investment, which hinges upon the investor's own temperament and attitude, is not much affected by the passing years."

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A price decline is of no real importance to the bona fide investor unless it is either very substantial say, more than a third from cost or unless it reflects a known deterioration of consequence in the company's position. In a well-defined bear market many sound common stocks sell temporarily at extraordinary low prices. It is possible that the investor may then have a paper loss of fully 50 per cent on some of his holdings, without any convincing indication that the underlying values have been permanently affected.

— Benjamin Graham