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Let there be light

This is what god says when he creates the light. But wait. How. I mean... What? There was no such thing as light but suddenly he invents it. What was he thinking? 

He definitely sees without light because he created earth before light. Then what is the purpose of light? He created ligt not for himself but for us to see. But wait a minute. Why would he create us in such a way that we need light to see but he doesn't. 

Does he need light? Or did he just think that it would be better if I create man in such a fashion that he will need something I make up in order to see.