We are unique because we are mortal, because any moment or day could be our last. We will never be more beautiful than we are now. We will never be on earth again.
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Take every day and cherish it. Life is a gift. Make the most of every day that comes, you may never get such opportunities again. Live your life, don't just exist. Let your presence be felt wherever you find yourself and let people remember you for something worth emulating.