I have looked in the mirror every morning and asked myself: "If today were the last day of my life, would I want to do what I am about to do today?" And whenever the answer has been "No" for too many days in a row, I know I need to change something.
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The original version of the "live each day" quote goes back at least to 1980, when the film Breaker Morant featured the following version (see the transcript here): "Live every day as if it were going to be your last. One day, you're sure to be right."