People who make no noise are dangerous.
Fear has many eyes and can see things underground.
Don't think there are no crocodiles because the water is calm
We have learned now that we cannot regard this planet as being fenced in and a secure abiding place for Man we can never anticipate the unseen good or evil that may come upon us suddenly out of space.
I'm scared of things that I can't see that can hurt me, you know.
There ought to be a man with a hammer behind the door of every happy man.
Poor Lucas, always trying to protect me from danger. He’d never guessed that I was the dangerous one.
Not knowing the thing that's chasing you is a lot scarier than seeing it right in front of you.