Of Good And Evil

Setsubun. The day when the oni (or demon) comes out to terrorise children who then drive him away by throwing beans at him. What fun. Let loose the monster from the id.

Dr. McCoy: Without the negative side, you wouldn't be the captain - you couldn't be, and you know it. Your strength of command lies mostly in him.
Captain Kirk: What do I have?
Dr. McCoy: You have the goodness.
Captain Kirk: Not enough. I have a ship to command.
Dr. McCoy: The intelligence, the logic. It appears your half has most of that, and perhaps that's where man's essential courage comes from. For you see, he was afraid, and you weren't.
(Star Trek, The Enemy Within)