If you think you are who you are, then, you might have missed something very important to consider. Who you are, is a topic which is involved in the conceptual word to describe the world. In your own conceptualization of the world, you are an identity of 'I', the very sternly stubborn self which indeed, means nothing but the wholeness is the ruler to support your own existence. You mean yourself but the idiotic stern conceptualization was to comply with the ruler to have its individualization which was later thrown into the worldly deeds. 

Mistakes are essential for thriving a life. There are not anything which should have been Time and Space, consummating the conceptualization of Being. Nothing falls but when there is a fall, there is individual.

So that the reason is something so artificial. It is a term to describe and satisfy the thirst of attaining the vague goal to achieve the dream of Knowledge!