Why?

Why do we bang our had on the rock when we know that its going to hurt us in the anyways? 

Why do we make make same mistakes again and again when we know that result will going to be same? 

Why can't we understand simplest things in the life? 

Why its so hard to draw lines sometimes? 

Why do we give up so early sometimes? 

Why its so hard to understand people and its so hard for them to understand you? 

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Lot of questions, but no answer...