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Because if you practice, train, and rehearse believing in yourself, it will become second nature. If you practice, train, and rehearse giving 100 percent, 100 percent of the time, that will become second nature, too. But if you practice, train, and rehearse being negative, miserable, and depressed, well, that’s what you’ll be good at.
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Greg Harden (Stay Sane in an Insane World: How to Control the Controllables and Thrive)