Please post all quotes separately, so that they can be voted up/​down separately. (If they are strongly related, reply to your own comments. If strongly ordered, then go ahead and post them together.)
Do not quote yourself.
But please feel free to quote posts and comments from Less Wrong or Overcoming Bias.
Quotes on Existential Risk
Similar to the AGI Quotes thread and the monthly Rationality Quotes threads, this is a thread for memorable quotes about existential risk.
Please post all quotes separately, so that they can be voted up/​down separately. (If they are strongly related, reply to your own comments. If strongly ordered, then go ahead and post them together.)
Do not quote yourself.