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It is always there, saying something, either guiding you or misguiding you, either motivating you or putting you down. It's your inner voice. If you've seen cartoons before, you've most probably noticed how, very often, a character is faced with a 'serious' moral decision. Should he pull the prank - or not? Then, out of thin air, an angel and a devil appear by his two ears. Obviously, one will tell him to go ahead and do it while the other will exhort him to refrain.