Buy when there is blood in the streets, even if the blood is your own.

Investors
Nathan Mayer Rothschild
Born in 1777 in the Frankfurt ghetto, Nathan Mayer Rothschild emigrated alone to England at twenty-one and rose to the pinnacle of the City of London. During the Napoleonic Wars he amassed a vast fortune through war-financing for the British government and sovereign-bond trading, becoming widely regarded as the wealthiest person in the world by the 1820s. His use of speed and accuracy of information to move markets formed the prototype of modern investment banking.
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Nathan Mayer Rothschild's Other Quotes
I care not what puppet is placed upon the throne of England to rule the Empire on which the sun never sets.
It requires a great deal of boldness and a great deal of caution to make a great fortune; and when you have got it, it requires ten times as much wit to keep it.
The time to buy is when there's blood in the streets.
I never buy at the bottom and I always sell too soon.
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