"A sound philosophy of life, I think, may be the most valuable asset for a psychiatrist to have when he is treating a patient."

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The biggest mistake investors make is to believe that what happened in the recent past is likely to persist. They assume that something that was a good investment in the recent past is still a good investment. Typically, high past returns simply imply that an asset has become more expensive and is a poorer, not better, investment.

— Ray Dalio