“My argument against God was that the universe seemed so cruel and unjust.
But how had I got this idea of just and unjust? A man does not call a line crooked unless he has some idea of a straight line.
Thus in the very act of trying to prove that God did not exist – in other words, that the whole of reality was senseless – I found I was forced to assume that one part of reality – namely my idea of justice – was full of sense. Consequently atheism turns out to be too simple.”  
~ C.S. Lewis, Mere Christianity