what you can't see and what you don't know

- You must stop it. He's going to get killed.

- That is possible.

- But you can't, you can't... you stupid fools!

- See to your friend. He was a brave man.

- You could have killed him at will.

- Yes?

- Why the deception?

- Deception is the point!
   Any fool can calculate strength. That one has been doing it from the moment he saw us.

   Now he has to calculate what he can't see
- ... and fear what he doesn't know.

The 13th Warrior (1999)