Who does Warren Buffett turn to for wise counsel? His longtime business partner, Charlie Munger. Buffett wrote in his latest letter to Berkshire Hathaway shareholders that he never has a conversation with Munger without learning something. 

Munger is definitely a fount of wisdom. He was asked a few years ago by CNBC's Becky Quick what the secret to a happy life was. The multibillionaire responded with six "simple rules" -- and one of them is vital to investors. 

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Source Fool.com