Everybody has something that chews them up and for me that thing was always loneliness. The cinema has the power to make you not feel lonely even when you are.
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.