Fear.

It is something vital to us puny creatures. The instant man starts fearing is the instant the species will reach a dead end, only to sink to pitiful lows, only to sit and wait apathetically for extinction! Wake up! DON'T BE AFRAID OF KNOWLEDGE!

Humans who lose the capacity to think become creatures whose existence has no value. Think! You humans, who are split into two worlds. Unless you want the gulf between humans to expand into oblivion, you must THINK!

Signed, Schwarzwald.