Stuart Russell:

Is it necessary to worry about undecidability for AI systems that rewrite themselves?

Roderick Usher:

I dread the events of the future, not in themselves, but in their results.

I shudder at the thought of any, even the most trivial, incident, which may operate upon this intolerable agitation of soul.

I have, indeed, no abhorrence of danger, except in its absolute effect -- in terror.

In this unnerved, in this pitiable, condition I feel that the period will sooner or later arrive when I must abandon life and reason together, in some struggle with the grim phantasm, FEAR.

Thomas Fuentes:

Keep Fear Alive. Keep it alive.