You know something ,But you don't understant it !

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You know you should study hard, but you still get some kind of lazy day. You know you may pay too much to something, but you still do it. Some experienced man want you know which tree are fruitless. But you just know it, you still take the way to the fruitless tree. Well,you know it but you don't understand it. Understanding something is the strong feeling that you really want to do it.What you do is what you are willing to do. You will never understand it unless you have experience on it. The different people who have the same experience may understand different thing. unfortunately, it's too late for you to understand something.