What's your mantra in life?

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mine is actually the serenity prayer "God, grant me the serenity to accept the things I cannot change, Courage to change the things I can, And wisdom to know the difference" why? because I often find myself stressing out on things that I have no control of and I need constant reminder. I guess it's my obsession to create certainty in my life which frustrates me the most and that's why I feel really bad if something do not go my way or my expectations. What about you guys? Anything that helps you get by?