Everybody has a Dr. Jekyll and Mr. Hyde in their personality.
You cannot be a do-gooder without having a mean streak within you. Good and bad are two sides of the same coin. Duality of human nature is necessary to create harmony.
Celebrate the darker side within you. It is the darker side that gives sheen to your personality. Here are dark quotes that bring out the best and the worst out of it.
Light thinks it travels faster than anything but it is wrong. No matter how fast light travels, it finds the darkness has always got there first, and is waiting for it.