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I think this is difficult and controversal question. I am convinced hard work is nessesary but not enogth for success. Humans life is not a straigh line, we every day face with unexpected things and events which are often byend our control. The obvious thing that we can not choose is our family. Often rich people are just children of their rich parents, on the other hand ordinary farmers children have to hard work in a village to continue family traditions. However there are a lot of examples when famous persons children lose all that they got from the parents because they were lazy and irresponsible. Sometimes you work is directly connected to luck, like financial analytics, investors or even scientists. For instance different scientific groups work in many directions developing their own theories. But after additional experiments only one of them will reflect the truth. In this example only the people who have guessed the right way will succeed. 