Evil has reality only insofar as we support it with negative thinking. We do not have to be afraid of negative thoughts if we do not welcome them. They are in the air, and they may knock at anyone's door; but if we do not embrace them, ask them in, and make them our own, they can have no power over us.
— Eknath Easwaran, The Bhagavad Gita for Daily Living, Volume 3