He's really sort of the devil. He's completely emotionally detached. He has no empathy. You find that in psychopaths. It's about power with Voldemort. It's an aphrodisiac for him. Power makes him feel alive.
What makes Superman a hero is not that he has power but that he has the wisdom and the maturity to use the power wisely. From an acting point of view that's how I approached the part.
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Knowing that you are completely forgiven destroys the power of sin in your life.
