What is favorit quote/principle in life?

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Hi, I'm trying to gather the best quotes/principles in life which you could live by. It can be a quote like "If there is a will then there is a way" or an experience which taught you a great lesson. Please help me by posting your experiences and maybe we can learn from each other. Ok I'll start first, here is my principle/quote. "Life is like a game of poker" In poker we are given a set of cards. Sometimes you decide to fold, sometimes you play all in, sometimes you blough, sometimes you wait for the exact opportunity and sometimes even though you have a pair of Ace, you still don't have a guarantee of winning. For me the game exactly resembles life in a way. What about you?