Happy New Year! Here's the latest and greatest installment of rationality quotes. Remember:

• 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• Do not quote yourself
• Do not quote comments/posts on LessWrong or Overcoming Bias
  
• No more than 5 quotes per person per monthly thread, please