what's the purpose of our lives?

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I sometimes wonder that what is the purpose of lives? working hard to make more money,but the next don't konw what should i to do? making more money to change the live,when i make more money i found that i lost a lot of things.no friends ,no relative,even lost the goal of the life.then i often tell myself what's the purpose of my live ,sometimes i relly don't know!