"Remember, today is the tomorrow you worried about yesterday."
"Enthusiasm is that ingredient of vitality mixed with a firm belief in what you are doing that ensures the success of any project you undertake."
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Source: Dale Carnegie (2010). “How To Win Friends and Influence People”, p.131, Simon and Schuster
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"It isn't what you have, or who you are, or where you are, or what you are doing that makes you happy or unhappy. It is what you think about."
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