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What is the Most Important Key to Get Success?

People all around the world are eager for success. If life is a big treasury, success is the most valuable and splendid diamond in it. Only a few of us manage to get the key, but so many people can just stare at the door but do nothing during their whole lives.
Then what is the most important key to get success?
Some people may say whether a person can be successful depend on his idea (dream). They think once one has a dream he will try his best to realize it. Maybe he can not get it, but as the saying goes: upper dreams always lead to ordinary results and middle ones always lead to bad results. I do not agree with this kind of idea. It is so subjective and ignores the real life. Life is complex, only a good dream is far away from success. Sometimes, dreams are only tools of the weak, who use them to cover their inability.
In some others' opinions, self-confidence is the m