"Remember, today is the tomorrow you worried about yesterday."
"Almost all the progress ever made in human thought has been made by the Doubting Thomas's, the questioners, the challengers, the show-me crowd."
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Source: Dale Carnegie (2010). “How To Enjoy Your Life And Your Job”, p.62, 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."
"If you are not in the process of becoming the person you want to be, you are automatically engaged in becoming the person you don't want to be."
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