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Tony Robbins
Performance coach

In 1979, when I was 19, I had all these people giving me conflicting advice. Jim Rohn, a personal-development speaker, said, 'Tony, think about it this way. If your worst enemy drops sugar in your coffee, what's going to happen to you? Nothing. But what if your best friend drops strychnine in your coffee? You're dead. You have to stand guard at the door of your mind." He was saying that the selection of [my friends and advisors] will matter more than anything else, and that you can't take anybody's approach as sacrosanct.

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Last updated April 30 2008: 4:31 PM ET